<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with Wdesk from Workiva-->
<!--Copyright 2022 Workiva-->
<!--r:ac81c792-8d44-4ca0-9cd5-2ea7f984a933,g:048d53ef-d02f-4af1-823a-5628eaad641a-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedPeriodStartLabel" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedPeriodStartLabel"/>
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/netLabel" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/net-2009-12-16.xsd#netLabel"/>
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedNetLabel" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedNetLabel"/>
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedTerseLabel"/>
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedPeriodEndLabel" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedPeriodEndLabel"/>
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedLabel"/>
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedTotalLabel" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedTotalLabel"/>
  <link:labelLink xlink:role="http://www.xbrl.org/2003/role/link" xlink:type="extended">
    <link:label id="lab_ifrs-full_IncomeTaxRelatingToRemeasurementsOfDefinedBenefitPlansOfOtherComprehensiveIncome_4dd580b5-20d5-45d0-91f2-111289d5ec09_negatedLabel_pt" xlink:label="lab_ifrs-full_IncomeTaxRelatingToRemeasurementsOfDefinedBenefitPlansOfOtherComprehensiveIncome" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Imposto sobre o rendimento relativo às remensurações dos planos de benefícios definidos incluídos em outro rendimento integral</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncomeTaxRelatingToRemeasurementsOfDefinedBenefitPlansOfOtherComprehensiveIncome" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_IncomeTaxRelatingToRemeasurementsOfDefinedBenefitPlansOfOtherComprehensiveIncome"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_IncomeTaxRelatingToRemeasurementsOfDefinedBenefitPlansOfOtherComprehensiveIncome" xlink:to="lab_ifrs-full_IncomeTaxRelatingToRemeasurementsOfDefinedBenefitPlansOfOtherComprehensiveIncome" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_Assets_9d3ed2b8-0848-4620-ab93-76bb0671dba9_totalLabel_pt" xlink:label="lab_ifrs-full_Assets" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Total assets</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Assets" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_Assets"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_Assets" xlink:to="lab_ifrs-full_Assets" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CurrentAssetsOtherThanAssetsOrDisposalGroupsClassifiedAsHeldForSaleOrAsHeldForDistributionToOwners_48a2bd3c-2820-463a-b378-e264757a4b6d_totalLabel_pt" xlink:label="lab_ifrs-full_CurrentAssetsOtherThanAssetsOrDisposalGroupsClassifiedAsHeldForSaleOrAsHeldForDistributionToOwners" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Total current assets other than non-current assets or disposal groups classified as held for sale or as held for distribution to owners</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentAssetsOtherThanAssetsOrDisposalGroupsClassifiedAsHeldForSaleOrAsHeldForDistributionToOwners" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CurrentAssetsOtherThanAssetsOrDisposalGroupsClassifiedAsHeldForSaleOrAsHeldForDistributionToOwners"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CurrentAssetsOtherThanAssetsOrDisposalGroupsClassifiedAsHeldForSaleOrAsHeldForDistributionToOwners" xlink:to="lab_ifrs-full_CurrentAssetsOtherThanAssetsOrDisposalGroupsClassifiedAsHeldForSaleOrAsHeldForDistributionToOwners" xlink:type="arc" order="1"/>
    <link:label id="lab_ctt_AtivosImobiliariosEEquipamentosEDireitoDeUso_label_pt" xlink:label="lab_ctt_AtivosImobiliariosEEquipamentosEDireitoDeUso" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Ativos Imobiliarios e Equipamentos e Direito de Uso</link:label>
    <link:label id="lab_ctt_AtivosImobiliariosEEquipamentosEDireitoDeUso_documentation_pt" xlink:label="lab_ctt_AtivosImobiliariosEEquipamentosEDireitoDeUso" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Ativos Imobiliarios e Equipamentos e Direito de Uso</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ctt_AtivosImobiliariosEEquipamentosEDireitoDeUso" xlink:href="002367-2021-12-31.xsd#ctt_AtivosImobiliariosEEquipamentosEDireitoDeUso"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctt_AtivosImobiliariosEEquipamentosEDireitoDeUso" xlink:to="lab_ctt_AtivosImobiliariosEEquipamentosEDireitoDeUso" xlink:type="arc" order="1"/>
    <link:label id="lab_ctt_OutrosAtivosFinanceirosBancariosNaoCirculantes_label_pt" xlink:label="lab_ctt_OutrosAtivosFinanceirosBancariosNaoCirculantes" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Outros Ativos Financeiros Bancarios Nao Circulantes</link:label>
    <link:label id="lab_ctt_OutrosAtivosFinanceirosBancariosNaoCirculantes_documentation_pt" xlink:label="lab_ctt_OutrosAtivosFinanceirosBancariosNaoCirculantes" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Outros Ativos Financeiros Bancarios Nao Circulantes</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ctt_OutrosAtivosFinanceirosBancariosNaoCirculantes" xlink:href="002367-2021-12-31.xsd#ctt_OutrosAtivosFinanceirosBancariosNaoCirculantes"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctt_OutrosAtivosFinanceirosBancariosNaoCirculantes" xlink:to="lab_ctt_OutrosAtivosFinanceirosBancariosNaoCirculantes" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_NoncurrentLiabilities_66e76632-1a05-4867-a592-59654f5e2c11_totalLabel_pt" xlink:label="lab_ifrs-full_NoncurrentLiabilities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Total non-current liabilities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncurrentLiabilities" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_NoncurrentLiabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_NoncurrentLiabilities" xlink:to="lab_ifrs-full_NoncurrentLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_ctt_PagamentosEmDinheiroParaDepositosAVista_label_pt" xlink:label="lab_ctt_PagamentosEmDinheiroParaDepositosAVista" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Pagamentos em Dinheiro para Depositos a Vista</link:label>
    <link:label id="lab_ctt_PagamentosEmDinheiroParaDepositosAVista_documentation_pt" xlink:label="lab_ctt_PagamentosEmDinheiroParaDepositosAVista" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Pagamentos em Dinheiro para Depositos a Vista</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ctt_PagamentosEmDinheiroParaDepositosAVista" xlink:href="002367-2021-12-31.xsd#ctt_PagamentosEmDinheiroParaDepositosAVista"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctt_PagamentosEmDinheiroParaDepositosAVista" xlink:to="lab_ctt_PagamentosEmDinheiroParaDepositosAVista" xlink:type="arc" order="1"/>
    <link:label id="lab_ctt_Confirming_label_pt" xlink:label="lab_ctt_Confirming" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Confirming</link:label>
    <link:label id="lab_ctt_Confirming_documentation_pt" xlink:label="lab_ctt_Confirming" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Confirming</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ctt_Confirming" xlink:href="002367-2021-12-31.xsd#ctt_Confirming"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctt_Confirming" xlink:to="lab_ctt_Confirming" xlink:type="arc" order="1"/>
    <link:label id="lab_ctt_LucroLiquidoMember_label_pt" xlink:label="lab_ctt_LucroLiquidoMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Lucro Liquido [Member]</link:label>
    <link:label id="lab_ctt_LucroLiquidoMember_documentation_pt" xlink:label="lab_ctt_LucroLiquidoMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Lucro Liquido</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ctt_LucroLiquidoMember" xlink:href="002367-2021-12-31.xsd#ctt_LucroLiquidoMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctt_LucroLiquidoMember" xlink:to="lab_ctt_LucroLiquidoMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ctt_AumentoDiminuicaoPorMeioDeOutraTransacaoPatrimonio_84253d2c-f547-4b7b-8d02-c8bdeb04840a_totalLabel_pt" xlink:label="lab_ctt_AumentoDiminuicaoPorMeioDeOutraTransacaoPatrimonio" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Aumento (diminuição) por meio de outra transação, patrimônio</link:label>
    <link:label id="lab_ctt_AumentoDiminuicaoPorMeioDeOutraTransacaoPatrimonio_label_pt" xlink:label="lab_ctt_AumentoDiminuicaoPorMeioDeOutraTransacaoPatrimonio" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Aumento (Diminuicao) Por Meio De Outra Transacao, Patrimonio</link:label>
    <link:label id="lab_ctt_AumentoDiminuicaoPorMeioDeOutraTransacaoPatrimonio_documentation_pt" xlink:label="lab_ctt_AumentoDiminuicaoPorMeioDeOutraTransacaoPatrimonio" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Aumento (Diminuicao) Por Meio De Outra Transacao, Patrimonio</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ctt_AumentoDiminuicaoPorMeioDeOutraTransacaoPatrimonio" xlink:href="002367-2021-12-31.xsd#ctt_AumentoDiminuicaoPorMeioDeOutraTransacaoPatrimonio"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctt_AumentoDiminuicaoPorMeioDeOutraTransacaoPatrimonio" xlink:to="lab_ctt_AumentoDiminuicaoPorMeioDeOutraTransacaoPatrimonio" xlink:type="arc" order="1"/>
    <link:label id="lab_ctt_CaixaEEquivalentesDeCaixaDepositosAVista_label_pt" xlink:label="lab_ctt_CaixaEEquivalentesDeCaixaDepositosAVista" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Caixa E Equivalentes De Caixa, Depositos A Vista</link:label>
    <link:label id="lab_ctt_CaixaEEquivalentesDeCaixaDepositosAVista_documentation_pt" xlink:label="lab_ctt_CaixaEEquivalentesDeCaixaDepositosAVista" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Caixa E Equivalentes De Caixa, Depositos A Vista</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ctt_CaixaEEquivalentesDeCaixaDepositosAVista" xlink:href="002367-2021-12-31.xsd#ctt_CaixaEEquivalentesDeCaixaDepositosAVista"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctt_CaixaEEquivalentesDeCaixaDepositosAVista" xlink:to="lab_ctt_CaixaEEquivalentesDeCaixaDepositosAVista" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_Liabilities_9d2f55e8-5c82-4493-98a6-9384915a02f4_totalLabel_pt" xlink:label="lab_ifrs-full_Liabilities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Total liabilities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Liabilities" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_Liabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_Liabilities" xlink:to="lab_ifrs-full_Liabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CurrentLiabilities_8394d0b0-2595-4309-a94b-d7babc1b7bcc_totalLabel_pt" xlink:label="lab_ifrs-full_CurrentLiabilities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Total current liabilities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentLiabilities" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CurrentLiabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CurrentLiabilities" xlink:to="lab_ifrs-full_CurrentLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_NoncurrentAssets_c27f9859-526f-4290-af08-63f77cae4e01_totalLabel_pt" xlink:label="lab_ifrs-full_NoncurrentAssets" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Total non-current assets</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncurrentAssets" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_NoncurrentAssets"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_NoncurrentAssets" xlink:to="lab_ifrs-full_NoncurrentAssets" xlink:type="arc" order="1"/>
    <link:label id="lab_ctt_ReembolsosDeDepositos_label_pt" xlink:label="lab_ctt_ReembolsosDeDepositos" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Reembolsos De Depositos</link:label>
    <link:label id="lab_ctt_ReembolsosDeDepositos_documentation_pt" xlink:label="lab_ctt_ReembolsosDeDepositos" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Reembolsos De Depositos</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ctt_ReembolsosDeDepositos" xlink:href="002367-2021-12-31.xsd#ctt_ReembolsosDeDepositos"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctt_ReembolsosDeDepositos" xlink:to="lab_ctt_ReembolsosDeDepositos" xlink:type="arc" order="1"/>
    <link:label id="lab_ctt_OutrosAtivosFinanceirosBancariosAtuais_label_pt" xlink:label="lab_ctt_OutrosAtivosFinanceirosBancariosAtuais" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Outros Ativos Financeiros Bancarios Atuais</link:label>
    <link:label id="lab_ctt_OutrosAtivosFinanceirosBancariosAtuais_documentation_pt" xlink:label="lab_ctt_OutrosAtivosFinanceirosBancariosAtuais" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Outros Ativos Financeiros Bancarios Atuais</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ctt_OutrosAtivosFinanceirosBancariosAtuais" xlink:href="002367-2021-12-31.xsd#ctt_OutrosAtivosFinanceirosBancariosAtuais"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctt_OutrosAtivosFinanceirosBancariosAtuais" xlink:to="lab_ctt_OutrosAtivosFinanceirosBancariosAtuais" xlink:type="arc" order="1"/>
    <link:label id="lab_ctt_PagamentosParaOutrosPassivosFinanceirosBancarios_label_pt" xlink:label="lab_ctt_PagamentosParaOutrosPassivosFinanceirosBancarios" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Pagamentos Para Outros Passivos Financeiros Bancarios</link:label>
    <link:label id="lab_ctt_PagamentosParaOutrosPassivosFinanceirosBancarios_documentation_pt" xlink:label="lab_ctt_PagamentosParaOutrosPassivosFinanceirosBancarios" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Pagamentos Para Outros Passivos Financeiros Bancarios</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ctt_PagamentosParaOutrosPassivosFinanceirosBancarios" xlink:href="002367-2021-12-31.xsd#ctt_PagamentosParaOutrosPassivosFinanceirosBancarios"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctt_PagamentosParaOutrosPassivosFinanceirosBancarios" xlink:to="lab_ctt_PagamentosParaOutrosPassivosFinanceirosBancarios" xlink:type="arc" order="1"/>
    <link:label id="lab_ctt_PerdaPorImparidadeReconhecidaEmLucrosOuPerdasAtivosNaoDepreciaveis_label_pt" xlink:label="lab_ctt_PerdaPorImparidadeReconhecidaEmLucrosOuPerdasAtivosNaoDepreciaveis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Perda Por Imparidade Reconhecida Em Lucros Ou Perdas, Ativos Nao Depreciaveis</link:label>
    <link:label id="lab_ctt_PerdaPorImparidadeReconhecidaEmLucrosOuPerdasAtivosNaoDepreciaveis_documentation_pt" xlink:label="lab_ctt_PerdaPorImparidadeReconhecidaEmLucrosOuPerdasAtivosNaoDepreciaveis" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Perda Por Imparidade Reconhecida Em Lucros Ou Perdas, Ativos Nao Depreciaveis</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ctt_PerdaPorImparidadeReconhecidaEmLucrosOuPerdasAtivosNaoDepreciaveis" xlink:href="002367-2021-12-31.xsd#ctt_PerdaPorImparidadeReconhecidaEmLucrosOuPerdasAtivosNaoDepreciaveis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctt_PerdaPorImparidadeReconhecidaEmLucrosOuPerdasAtivosNaoDepreciaveis" xlink:to="lab_ctt_PerdaPorImparidadeReconhecidaEmLucrosOuPerdasAtivosNaoDepreciaveis" xlink:type="arc" order="1"/>
    <link:label id="lab_ctt_ProdutoDeDepositos_label_pt" xlink:label="lab_ctt_ProdutoDeDepositos" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Produto De Depositos</link:label>
    <link:label id="lab_ctt_ProdutoDeDepositos_documentation_pt" xlink:label="lab_ctt_ProdutoDeDepositos" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Produto De Depositos</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ctt_ProdutoDeDepositos" xlink:href="002367-2021-12-31.xsd#ctt_ProdutoDeDepositos"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctt_ProdutoDeDepositos" xlink:to="lab_ctt_ProdutoDeDepositos" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_EquityAttributableToOwnersOfParent_c2193cec-148f-42b5-ac03-0c3f403d78e8_totalLabel_pt" xlink:label="lab_ifrs-full_EquityAttributableToOwnersOfParent" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Total equity attributable to owners of parent</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_EquityAttributableToOwnersOfParent" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_EquityAttributableToOwnersOfParent"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_EquityAttributableToOwnersOfParent" xlink:to="lab_ifrs-full_EquityAttributableToOwnersOfParent" xlink:type="arc" order="1"/>
    <link:label id="lab_ctt_CaixaEEquivalentesDeCaixaImparidadeAcumuladaDeDepositos_label_pt" xlink:label="lab_ctt_CaixaEEquivalentesDeCaixaImparidadeAcumuladaDeDepositos" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Caixa E Equivalentes De Caixa, Imparidade Acumulada De Depositos</link:label>
    <link:label id="lab_ctt_CaixaEEquivalentesDeCaixaImparidadeAcumuladaDeDepositos_documentation_pt" xlink:label="lab_ctt_CaixaEEquivalentesDeCaixaImparidadeAcumuladaDeDepositos" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Caixa E Equivalentes De Caixa, Imparidade Acumulada De Depositos</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ctt_CaixaEEquivalentesDeCaixaImparidadeAcumuladaDeDepositos" xlink:href="002367-2021-12-31.xsd#ctt_CaixaEEquivalentesDeCaixaImparidadeAcumuladaDeDepositos"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctt_CaixaEEquivalentesDeCaixaImparidadeAcumuladaDeDepositos" xlink:to="lab_ctt_CaixaEEquivalentesDeCaixaImparidadeAcumuladaDeDepositos" xlink:type="arc" order="1"/>
    <link:label id="lab_ctt_CreditoNaoCorrenteParaClientesBancarios_label_pt" xlink:label="lab_ctt_CreditoNaoCorrenteParaClientesBancarios" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Credito Nao Corrente Para Clientes Bancarios</link:label>
    <link:label id="lab_ctt_CreditoNaoCorrenteParaClientesBancarios_documentation_pt" xlink:label="lab_ctt_CreditoNaoCorrenteParaClientesBancarios" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Credito Nao Corrente Para Clientes Bancarios</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ctt_CreditoNaoCorrenteParaClientesBancarios" xlink:href="002367-2021-12-31.xsd#ctt_CreditoNaoCorrenteParaClientesBancarios"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctt_CreditoNaoCorrenteParaClientesBancarios" xlink:to="lab_ctt_CreditoNaoCorrenteParaClientesBancarios" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition_e594f7a0-0bf6-4946-9ebd-96b382ab78c6_periodStartLabel_pt" xlink:label="lab_ifrs-full_CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Cash and cash equivalents if different from statement of financial position</link:label>
    <link:label id="lab_ifrs-full_CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition_a14eff88-ba4f-4c46-9e84-03558f837736_periodEndLabel_pt" xlink:label="lab_ifrs-full_CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Caixa e equivalentes de caixa se diferentes da demonstração da posição financeira</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition" xlink:to="lab_ifrs-full_CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ProfitLossFromOperatingActivities_c7c8a0d4-7ff4-4fa4-8fdc-9eb3a5c34dd9_totalLabel_pt" xlink:label="lab_ifrs-full_ProfitLossFromOperatingActivities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Profit (loss) from operating activities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProfitLossFromOperatingActivities" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ProfitLossFromOperatingActivities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ProfitLossFromOperatingActivities" xlink:to="lab_ifrs-full_ProfitLossFromOperatingActivities" xlink:type="arc" order="1"/>
    <link:label id="lab_ctt_PagamentosEmDinheiroParaOutrosAtivosFinanceirosBancarios_label_pt" xlink:label="lab_ctt_PagamentosEmDinheiroParaOutrosAtivosFinanceirosBancarios" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Pagamentos Em Dinheiro Para Outros Ativos Financeiros Bancarios</link:label>
    <link:label id="lab_ctt_PagamentosEmDinheiroParaOutrosAtivosFinanceirosBancarios_documentation_pt" xlink:label="lab_ctt_PagamentosEmDinheiroParaOutrosAtivosFinanceirosBancarios" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Pagamentos Em Dinheiro Para Outros Ativos Financeiros Bancarios</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ctt_PagamentosEmDinheiroParaOutrosAtivosFinanceirosBancarios" xlink:href="002367-2021-12-31.xsd#ctt_PagamentosEmDinheiroParaOutrosAtivosFinanceirosBancarios"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctt_PagamentosEmDinheiroParaOutrosAtivosFinanceirosBancarios" xlink:to="lab_ctt_PagamentosEmDinheiroParaOutrosAtivosFinanceirosBancarios" xlink:type="arc" order="1"/>
    <link:label id="lab_ctt_PagamentosEmDinheiroParaAtivosFinanceirosAoValorJustoPorMeioDeOutrosRendimentosAbrangentes_label_pt" xlink:label="lab_ctt_PagamentosEmDinheiroParaAtivosFinanceirosAoValorJustoPorMeioDeOutrosRendimentosAbrangentes" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Pagamentos Em Dinheiro Para Ativos Financeiros Ao Valor Justo Por Meio De Outros Rendimentos Abrangentes</link:label>
    <link:label id="lab_ctt_PagamentosEmDinheiroParaAtivosFinanceirosAoValorJustoPorMeioDeOutrosRendimentosAbrangentes_documentation_pt" xlink:label="lab_ctt_PagamentosEmDinheiroParaAtivosFinanceirosAoValorJustoPorMeioDeOutrosRendimentosAbrangentes" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Pagamentos Em Dinheiro Para Ativos Financeiros Ao Valor Justo Por Meio De Outros Rendimentos Abrangentes</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ctt_PagamentosEmDinheiroParaAtivosFinanceirosAoValorJustoPorMeioDeOutrosRendimentosAbrangentes" xlink:href="002367-2021-12-31.xsd#ctt_PagamentosEmDinheiroParaAtivosFinanceirosAoValorJustoPorMeioDeOutrosRendimentosAbrangentes"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctt_PagamentosEmDinheiroParaAtivosFinanceirosAoValorJustoPorMeioDeOutrosRendimentosAbrangentes" xlink:to="lab_ctt_PagamentosEmDinheiroParaAtivosFinanceirosAoValorJustoPorMeioDeOutrosRendimentosAbrangentes" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ComprehensiveIncome_8bb4958f-bac7-4969-a063-0042b14a73a7_totalLabel_pt" xlink:label="lab_ifrs-full_ComprehensiveIncome" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Rendimento integral</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComprehensiveIncome" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ComprehensiveIncome"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ComprehensiveIncome" xlink:to="lab_ifrs-full_ComprehensiveIncome" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_Equity_f1ecac9d-eef6-42c6-88a0-7c0ad5d43804_totalLabel_pt" xlink:label="lab_ifrs-full_Equity" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Total equity</link:label>
    <link:label id="lab_ifrs-full_Equity_4032483c-4538-44fb-8ffd-0397c11898e1_periodStartLabel_pt" xlink:label="lab_ifrs-full_Equity" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Equity</link:label>
    <link:label id="lab_ifrs-full_Equity_017d4022-c15e-457a-ae46-bf17f1f46389_periodEndLabel_pt" xlink:label="lab_ifrs-full_Equity" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Equity</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Equity" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_Equity"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_Equity" xlink:to="lab_ifrs-full_Equity" xlink:type="arc" order="1"/>
    <link:label id="lab_ctt_OutrasReceitasDespesasNaoOperacionais_93c9afd9-3fcb-4bef-8f87-8e97491a9cce_totalLabel_pt" xlink:label="lab_ctt_OutrasReceitasDespesasNaoOperacionais" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Other Nonoperating Income (Expense)</link:label>
    <link:label id="lab_ctt_OutrasReceitasDespesasNaoOperacionais_label_pt" xlink:label="lab_ctt_OutrasReceitasDespesasNaoOperacionais" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Outras Receitas (Despesas) Nao Operacionais</link:label>
    <link:label id="lab_ctt_OutrasReceitasDespesasNaoOperacionais_documentation_pt" xlink:label="lab_ctt_OutrasReceitasDespesasNaoOperacionais" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Outras Receitas (Despesas) Nao Operacionais</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ctt_OutrasReceitasDespesasNaoOperacionais" xlink:href="002367-2021-12-31.xsd#ctt_OutrasReceitasDespesasNaoOperacionais"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctt_OutrasReceitasDespesasNaoOperacionais" xlink:to="lab_ctt_OutrasReceitasDespesasNaoOperacionais" xlink:type="arc" order="1"/>
    <link:label id="lab_ctt_DinheiroEEquivalentesDeDinheiroChequesPendentes_label_pt" xlink:label="lab_ctt_DinheiroEEquivalentesDeDinheiroChequesPendentes" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Dinheiro E Equivalentes De Dinheiro, Cheques Pendentes</link:label>
    <link:label id="lab_ctt_DinheiroEEquivalentesDeDinheiroChequesPendentes_documentation_pt" xlink:label="lab_ctt_DinheiroEEquivalentesDeDinheiroChequesPendentes" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Dinheiro E Equivalentes De Dinheiro, Cheques Pendentes</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ctt_DinheiroEEquivalentesDeDinheiroChequesPendentes" xlink:href="002367-2021-12-31.xsd#ctt_DinheiroEEquivalentesDeDinheiroChequesPendentes"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctt_DinheiroEEquivalentesDeDinheiroChequesPendentes" xlink:to="lab_ctt_DinheiroEEquivalentesDeDinheiroChequesPendentes" xlink:type="arc" order="1"/>
    <link:label id="lab_ctt_ProdutoDeOutrosDepositos_label_pt" xlink:label="lab_ctt_ProdutoDeOutrosDepositos" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Produto De Outros Depositos</link:label>
    <link:label id="lab_ctt_ProdutoDeOutrosDepositos_documentation_pt" xlink:label="lab_ctt_ProdutoDeOutrosDepositos" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Produto De Outros Depositos</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ctt_ProdutoDeOutrosDepositos" xlink:href="002367-2021-12-31.xsd#ctt_ProdutoDeOutrosDepositos"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctt_ProdutoDeOutrosDepositos" xlink:to="lab_ctt_ProdutoDeOutrosDepositos" xlink:type="arc" order="1"/>
    <link:label id="lab_ctt_OutrosPassivosFinanceirosBancariosNaoCorrentes_label_pt" xlink:label="lab_ctt_OutrosPassivosFinanceirosBancariosNaoCorrentes" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Outros Passivos Financeiros Bancarios Nao Correntes</link:label>
    <link:label id="lab_ctt_OutrosPassivosFinanceirosBancariosNaoCorrentes_documentation_pt" xlink:label="lab_ctt_OutrosPassivosFinanceirosBancariosNaoCorrentes" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Outros Passivos Financeiros Bancarios Nao Correntes</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ctt_OutrosPassivosFinanceirosBancariosNaoCorrentes" xlink:href="002367-2021-12-31.xsd#ctt_OutrosPassivosFinanceirosBancariosNaoCorrentes"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctt_OutrosPassivosFinanceirosBancariosNaoCorrentes" xlink:to="lab_ctt_OutrosPassivosFinanceirosBancariosNaoCorrentes" xlink:type="arc" order="1"/>
    <link:label id="lab_ctt_OutrosPassivosFinanceirosBancariosAtuais_label_pt" xlink:label="lab_ctt_OutrosPassivosFinanceirosBancariosAtuais" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Outros Passivos Financeiros Bancarios Atuais</link:label>
    <link:label id="lab_ctt_OutrosPassivosFinanceirosBancariosAtuais_documentation_pt" xlink:label="lab_ctt_OutrosPassivosFinanceirosBancariosAtuais" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Outros Passivos Financeiros Bancarios Atuais</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ctt_OutrosPassivosFinanceirosBancariosAtuais" xlink:href="002367-2021-12-31.xsd#ctt_OutrosPassivosFinanceirosBancariosAtuais"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctt_OutrosPassivosFinanceirosBancariosAtuais" xlink:to="lab_ctt_OutrosPassivosFinanceirosBancariosAtuais" xlink:type="arc" order="1"/>
    <link:label id="lab_ctt_RecibosEmDinheiroDeDepositosAVista_label_pt" xlink:label="lab_ctt_RecibosEmDinheiroDeDepositosAVista" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Recibos Em Dinheiro De Depositos A Vista</link:label>
    <link:label id="lab_ctt_RecibosEmDinheiroDeDepositosAVista_documentation_pt" xlink:label="lab_ctt_RecibosEmDinheiroDeDepositosAVista" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Recibos Em Dinheiro De Depositos A Vista</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ctt_RecibosEmDinheiroDeDepositosAVista" xlink:href="002367-2021-12-31.xsd#ctt_RecibosEmDinheiroDeDepositosAVista"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctt_RecibosEmDinheiroDeDepositosAVista" xlink:to="lab_ctt_RecibosEmDinheiroDeDepositosAVista" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CashFlowsFromUsedInInvestingActivities_dbc37b01-7d33-4b54-98a7-dc11cdfb26cd_totalLabel_pt" xlink:label="lab_ifrs-full_CashFlowsFromUsedInInvestingActivities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Cash flows from (used in) investing activities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashFlowsFromUsedInInvestingActivities" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CashFlowsFromUsedInInvestingActivities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CashFlowsFromUsedInInvestingActivities" xlink:to="lab_ifrs-full_CashFlowsFromUsedInInvestingActivities" xlink:type="arc" order="1"/>
    <link:label id="lab_ctt_GanhosPerdasEmInstrumentosFinanceirosAoValorJustoPorMeioDeLucroOuPerda_label_pt" xlink:label="lab_ctt_GanhosPerdasEmInstrumentosFinanceirosAoValorJustoPorMeioDeLucroOuPerda" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Ganhos (Perdas) Em Instrumentos Financeiros Ao Valor Justo Por Meio De Lucro Ou Perda</link:label>
    <link:label id="lab_ctt_GanhosPerdasEmInstrumentosFinanceirosAoValorJustoPorMeioDeLucroOuPerda_documentation_pt" xlink:label="lab_ctt_GanhosPerdasEmInstrumentosFinanceirosAoValorJustoPorMeioDeLucroOuPerda" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Ganhos (Perdas) em Instrumentos Financeiros ao Valor Justo por meio de Lucro ou Perda</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ctt_GanhosPerdasEmInstrumentosFinanceirosAoValorJustoPorMeioDeLucroOuPerda" xlink:href="002367-2021-12-31.xsd#ctt_GanhosPerdasEmInstrumentosFinanceirosAoValorJustoPorMeioDeLucroOuPerda"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctt_GanhosPerdasEmInstrumentosFinanceirosAoValorJustoPorMeioDeLucroOuPerda" xlink:to="lab_ctt_GanhosPerdasEmInstrumentosFinanceirosAoValorJustoPorMeioDeLucroOuPerda" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ProfitLossBeforeTax_4ddee942-2779-482c-8929-d60e147d5259_totalLabel_pt" xlink:label="lab_ifrs-full_ProfitLossBeforeTax" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Lucros (perdas) antes dos impostos</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProfitLossBeforeTax" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ProfitLossBeforeTax"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ProfitLossBeforeTax" xlink:to="lab_ifrs-full_ProfitLossBeforeTax" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CurrentAssets_da0470a9-fd54-4a61-a6b3-17eb4d79f2b1_totalLabel_pt" xlink:label="lab_ifrs-full_CurrentAssets" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Total current assets</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentAssets" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CurrentAssets"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CurrentAssets" xlink:to="lab_ifrs-full_CurrentAssets" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ProfitLoss_6236e4c1-eb17-43c7-9794-6d5f099585b2_totalLabel_pt" xlink:label="lab_ifrs-full_ProfitLoss" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Lucros (perdas)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProfitLoss" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ProfitLoss"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ProfitLoss" xlink:to="lab_ifrs-full_ProfitLoss" xlink:type="arc" order="1"/>
    <link:label id="lab_ctt_PagamentosEmDinheiroParaInvestimentoEmTitulosAValorJustoPorMeioDeOutrosRendimentosAbrangentes_label_pt" xlink:label="lab_ctt_PagamentosEmDinheiroParaInvestimentoEmTitulosAValorJustoPorMeioDeOutrosRendimentosAbrangentes" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Pagamentos Em Dinheiro Para Investimento Em Titulos A Valor Justo Por Meio De Outros Rendimentos Abrangentes</link:label>
    <link:label id="lab_ctt_PagamentosEmDinheiroParaInvestimentoEmTitulosAValorJustoPorMeioDeOutrosRendimentosAbrangentes_documentation_pt" xlink:label="lab_ctt_PagamentosEmDinheiroParaInvestimentoEmTitulosAValorJustoPorMeioDeOutrosRendimentosAbrangentes" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Pagamentos em dinheiro para investimento em títulos a valor justo por meio de outros rendimentos abrangentes</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ctt_PagamentosEmDinheiroParaInvestimentoEmTitulosAValorJustoPorMeioDeOutrosRendimentosAbrangentes" xlink:href="002367-2021-12-31.xsd#ctt_PagamentosEmDinheiroParaInvestimentoEmTitulosAValorJustoPorMeioDeOutrosRendimentosAbrangentes"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctt_PagamentosEmDinheiroParaInvestimentoEmTitulosAValorJustoPorMeioDeOutrosRendimentosAbrangentes" xlink:to="lab_ctt_PagamentosEmDinheiroParaInvestimentoEmTitulosAValorJustoPorMeioDeOutrosRendimentosAbrangentes" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_PurchaseOfTreasuryShares_8ee9e77c-3741-47b5-8926-3f8a8e6b681e_negatedLabel_pt" xlink:label="lab_ifrs-full_PurchaseOfTreasuryShares" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Compra de ações próprias</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PurchaseOfTreasuryShares" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_PurchaseOfTreasuryShares"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_PurchaseOfTreasuryShares" xlink:to="lab_ifrs-full_PurchaseOfTreasuryShares" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_IncreaseDecreaseInCashAndCashEquivalentsBeforeEffectOfExchangeRateChanges_29738628-124d-4ccf-9282-cdb5f255daa9_totalLabel_pt" xlink:label="lab_ifrs-full_IncreaseDecreaseInCashAndCashEquivalentsBeforeEffectOfExchangeRateChanges" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Increase (decrease) in cash and cash equivalents before effect of exchange rate changes</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseInCashAndCashEquivalentsBeforeEffectOfExchangeRateChanges" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_IncreaseDecreaseInCashAndCashEquivalentsBeforeEffectOfExchangeRateChanges"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_IncreaseDecreaseInCashAndCashEquivalentsBeforeEffectOfExchangeRateChanges" xlink:to="lab_ifrs-full_IncreaseDecreaseInCashAndCashEquivalentsBeforeEffectOfExchangeRateChanges" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_RevenueAndOperatingIncome_a47b39ef-d906-42c1-9c43-2d13459143c6_totalLabel_pt" xlink:label="lab_ifrs-full_RevenueAndOperatingIncome" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Rendimentos e outros rendimentos operacionais</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RevenueAndOperatingIncome" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_RevenueAndOperatingIncome"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_RevenueAndOperatingIncome" xlink:to="lab_ifrs-full_RevenueAndOperatingIncome" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_OtherComprehensiveIncome_6147759e-fca3-43dc-99b3-eb6417ce6861_totalLabel_pt" xlink:label="lab_ifrs-full_OtherComprehensiveIncome" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Outro rendimento integral</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherComprehensiveIncome" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherComprehensiveIncome"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_OtherComprehensiveIncome" xlink:to="lab_ifrs-full_OtherComprehensiveIncome" xlink:type="arc" order="1"/>
    <link:label id="lab_ctt_DepositosDeClientesBancariosNaoCorrentesEOutrosEmprestimos_label_pt" xlink:label="lab_ctt_DepositosDeClientesBancariosNaoCorrentesEOutrosEmprestimos" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Depositos De Clientes Bancarios Nao Correntes E Outros Emprestimos</link:label>
    <link:label id="lab_ctt_DepositosDeClientesBancariosNaoCorrentesEOutrosEmprestimos_documentation_pt" xlink:label="lab_ctt_DepositosDeClientesBancariosNaoCorrentesEOutrosEmprestimos" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Depositos De Clientes Bancarios Nao Correntes E Outros Emprestimos</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ctt_DepositosDeClientesBancariosNaoCorrentesEOutrosEmprestimos" xlink:href="002367-2021-12-31.xsd#ctt_DepositosDeClientesBancariosNaoCorrentesEOutrosEmprestimos"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctt_DepositosDeClientesBancariosNaoCorrentesEOutrosEmprestimos" xlink:to="lab_ctt_DepositosDeClientesBancariosNaoCorrentesEOutrosEmprestimos" xlink:type="arc" order="1"/>
    <link:label id="lab_ctt_LucroLiquido_label_pt" xlink:label="lab_ctt_LucroLiquido" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Lucro Liquido</link:label>
    <link:label id="lab_ctt_LucroLiquido_documentation_pt" xlink:label="lab_ctt_LucroLiquido" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Lucro Liquido</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ctt_LucroLiquido" xlink:href="002367-2021-12-31.xsd#ctt_LucroLiquido"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctt_LucroLiquido" xlink:to="lab_ctt_LucroLiquido" xlink:type="arc" order="1"/>
    <link:label id="lab_ctt_PerdaPorImparidadeReconhecidaEmLucrosOuPerdasOutrosAtivosFinanceirosBancarios_label_pt" xlink:label="lab_ctt_PerdaPorImparidadeReconhecidaEmLucrosOuPerdasOutrosAtivosFinanceirosBancarios" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Perda Por Imparidade Reconhecida Em Lucros Ou Perdas, Outros Ativos Financeiros Bancarios</link:label>
    <link:label id="lab_ctt_PerdaPorImparidadeReconhecidaEmLucrosOuPerdasOutrosAtivosFinanceirosBancarios_documentation_pt" xlink:label="lab_ctt_PerdaPorImparidadeReconhecidaEmLucrosOuPerdasOutrosAtivosFinanceirosBancarios" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Perda Por Imparidade Reconhecida Em Lucros Ou Perdas, Outros Ativos Financeiros Bancarios</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ctt_PerdaPorImparidadeReconhecidaEmLucrosOuPerdasOutrosAtivosFinanceirosBancarios" xlink:href="002367-2021-12-31.xsd#ctt_PerdaPorImparidadeReconhecidaEmLucrosOuPerdasOutrosAtivosFinanceirosBancarios"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctt_PerdaPorImparidadeReconhecidaEmLucrosOuPerdasOutrosAtivosFinanceirosBancarios" xlink:to="lab_ctt_PerdaPorImparidadeReconhecidaEmLucrosOuPerdasOutrosAtivosFinanceirosBancarios" xlink:type="arc" order="1"/>
    <link:label id="lab_ctt_CompraDeInstrumentosFinanceirosPeloValorJustoPorMeioDeLucroOuPrejuizo_ab5d9de8-384b-4511-a81c-89338d40f07e_terseLabel_pt" xlink:label="lab_ctt_CompraDeInstrumentosFinanceirosPeloValorJustoPorMeioDeLucroOuPrejuizo" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Compra De Instrumentos Financeiros Pelo Valor Justo Por Meio De Lucro Ou Prejuízo</link:label>
    <link:label id="lab_ctt_CompraDeInstrumentosFinanceirosPeloValorJustoPorMeioDeLucroOuPrejuizo_label_pt" xlink:label="lab_ctt_CompraDeInstrumentosFinanceirosPeloValorJustoPorMeioDeLucroOuPrejuizo" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Compra De Instrumentos Financeiros Pelo Valor Justo Por Meio De Lucro Ou Prejuizo</link:label>
    <link:label id="lab_ctt_CompraDeInstrumentosFinanceirosPeloValorJustoPorMeioDeLucroOuPrejuizo_documentation_pt" xlink:label="lab_ctt_CompraDeInstrumentosFinanceirosPeloValorJustoPorMeioDeLucroOuPrejuizo" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Compra De Instrumentos Financeiros Pelo Valor Justo Por Meio De Lucro Ou Prejuizo</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ctt_CompraDeInstrumentosFinanceirosPeloValorJustoPorMeioDeLucroOuPrejuizo" xlink:href="002367-2021-12-31.xsd#ctt_CompraDeInstrumentosFinanceirosPeloValorJustoPorMeioDeLucroOuPrejuizo"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctt_CompraDeInstrumentosFinanceirosPeloValorJustoPorMeioDeLucroOuPrejuizo" xlink:to="lab_ctt_CompraDeInstrumentosFinanceirosPeloValorJustoPorMeioDeLucroOuPrejuizo" xlink:type="arc" order="1"/>
    <link:label id="lab_ctt_RecebimentosEmDinheiroDeAtivosFinanceirosMensuradosAoValorJustoPorMeioDeLucrosOuPerdas_label_pt" xlink:label="lab_ctt_RecebimentosEmDinheiroDeAtivosFinanceirosMensuradosAoValorJustoPorMeioDeLucrosOuPerdas" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Recebimentos Em Dinheiro De Ativos Financeiros Mensurados Ao Valor Justo Por Meio De Lucros Ou Perdas</link:label>
    <link:label id="lab_ctt_RecebimentosEmDinheiroDeAtivosFinanceirosMensuradosAoValorJustoPorMeioDeLucrosOuPerdas_documentation_pt" xlink:label="lab_ctt_RecebimentosEmDinheiroDeAtivosFinanceirosMensuradosAoValorJustoPorMeioDeLucrosOuPerdas" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Recebimentos Em Dinheiro De Ativos Financeiros Mensurados Ao Valor Justo Por Meio De Lucros Ou Perdas</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ctt_RecebimentosEmDinheiroDeAtivosFinanceirosMensuradosAoValorJustoPorMeioDeLucrosOuPerdas" xlink:href="002367-2021-12-31.xsd#ctt_RecebimentosEmDinheiroDeAtivosFinanceirosMensuradosAoValorJustoPorMeioDeLucrosOuPerdas"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctt_RecebimentosEmDinheiroDeAtivosFinanceirosMensuradosAoValorJustoPorMeioDeLucrosOuPerdas" xlink:to="lab_ctt_RecebimentosEmDinheiroDeAtivosFinanceirosMensuradosAoValorJustoPorMeioDeLucrosOuPerdas" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CashFlowsFromUsedInFinancingActivities_6f8d6027-ceab-42c8-8b5a-92313e276f40_totalLabel_pt" xlink:label="lab_ifrs-full_CashFlowsFromUsedInFinancingActivities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Cash flows from (used in) financing activities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashFlowsFromUsedInFinancingActivities" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CashFlowsFromUsedInFinancingActivities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CashFlowsFromUsedInFinancingActivities" xlink:to="lab_ifrs-full_CashFlowsFromUsedInFinancingActivities" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CashAndCashEquivalents_d6f04c00-0527-4d36-9f78-1d28c64c42f6_totalLabel_pt" xlink:label="lab_ifrs-full_CashAndCashEquivalents" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Cash and cash equivalents</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashAndCashEquivalents" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CashAndCashEquivalents"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CashAndCashEquivalents" xlink:to="lab_ifrs-full_CashAndCashEquivalents" xlink:type="arc" order="1"/>
    <link:label id="lab_ctt_ProdutoDeDepositosDeClientesBancarios_label_pt" xlink:label="lab_ctt_ProdutoDeDepositosDeClientesBancarios" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Produto De Depositos De Clientes Bancarios</link:label>
    <link:label id="lab_ctt_ProdutoDeDepositosDeClientesBancarios_documentation_pt" xlink:label="lab_ctt_ProdutoDeDepositosDeClientesBancarios" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Produto de Depósitos de Clientes Bancários</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ctt_ProdutoDeDepositosDeClientesBancarios" xlink:href="002367-2021-12-31.xsd#ctt_ProdutoDeDepositosDeClientesBancarios"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctt_ProdutoDeDepositosDeClientesBancarios" xlink:to="lab_ctt_ProdutoDeDepositosDeClientesBancarios" xlink:type="arc" order="1"/>
    <link:label id="lab_ctt_RecebimentosEmDinheiroDeOutrosAtivosFinanceirosBancarios_label_pt" xlink:label="lab_ctt_RecebimentosEmDinheiroDeOutrosAtivosFinanceirosBancarios" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Recebimentos Em Dinheiro De Outros Ativos Financeiros Bancarios</link:label>
    <link:label id="lab_ctt_RecebimentosEmDinheiroDeOutrosAtivosFinanceirosBancarios_documentation_pt" xlink:label="lab_ctt_RecebimentosEmDinheiroDeOutrosAtivosFinanceirosBancarios" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Recebimentos em dinheiro de outros ativos financeiros bancários</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ctt_RecebimentosEmDinheiroDeOutrosAtivosFinanceirosBancarios" xlink:href="002367-2021-12-31.xsd#ctt_RecebimentosEmDinheiroDeOutrosAtivosFinanceirosBancarios"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctt_RecebimentosEmDinheiroDeOutrosAtivosFinanceirosBancarios" xlink:to="lab_ctt_RecebimentosEmDinheiroDeOutrosAtivosFinanceirosBancarios" xlink:type="arc" order="1"/>
    <link:label id="lab_ctt_GanhosPerdasEmInstrumentosFinanceirosAoValorJustoAtravesDeOutrosResultadosAbrangentes_label_pt" xlink:label="lab_ctt_GanhosPerdasEmInstrumentosFinanceirosAoValorJustoAtravesDeOutrosResultadosAbrangentes" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Ganhos (Perdas) Em Instrumentos Financeiros Ao Valor Justo Atraves De Outros Resultados Abrangentes</link:label>
    <link:label id="lab_ctt_GanhosPerdasEmInstrumentosFinanceirosAoValorJustoAtravesDeOutrosResultadosAbrangentes_documentation_pt" xlink:label="lab_ctt_GanhosPerdasEmInstrumentosFinanceirosAoValorJustoAtravesDeOutrosResultadosAbrangentes" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Ganhos (Perdas) Em Instrumentos Financeiros Ao Valor Justo Atraves De Outros Resultados Abrangentes</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ctt_GanhosPerdasEmInstrumentosFinanceirosAoValorJustoAtravesDeOutrosResultadosAbrangentes" xlink:href="002367-2021-12-31.xsd#ctt_GanhosPerdasEmInstrumentosFinanceirosAoValorJustoAtravesDeOutrosResultadosAbrangentes"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctt_GanhosPerdasEmInstrumentosFinanceirosAoValorJustoAtravesDeOutrosResultadosAbrangentes" xlink:to="lab_ctt_GanhosPerdasEmInstrumentosFinanceirosAoValorJustoAtravesDeOutrosResultadosAbrangentes" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_TreasuryShares_6ade1e9b-da78-405e-97de-b8f84964364e_negatedLabel_pt" xlink:label="lab_ifrs-full_TreasuryShares" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Ações próprias</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TreasuryShares" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_TreasuryShares"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_TreasuryShares" xlink:to="lab_ifrs-full_TreasuryShares" xlink:type="arc" order="1"/>
    <link:label id="lab_ctt_CreditoAtualParaClientesBancarios_label_pt" xlink:label="lab_ctt_CreditoAtualParaClientesBancarios" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Credito Atual Para Clientes Bancarios</link:label>
    <link:label id="lab_ctt_CreditoAtualParaClientesBancarios_documentation_pt" xlink:label="lab_ctt_CreditoAtualParaClientesBancarios" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Credito Atual Para Clientes Bancarios</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ctt_CreditoAtualParaClientesBancarios" xlink:href="002367-2021-12-31.xsd#ctt_CreditoAtualParaClientesBancarios"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctt_CreditoAtualParaClientesBancarios" xlink:to="lab_ctt_CreditoAtualParaClientesBancarios" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CashFlowsFromUsedInOperations_6c6e1b06-0490-4da7-9102-b97fa1cd0a09_totalLabel_pt" xlink:label="lab_ifrs-full_CashFlowsFromUsedInOperations" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Fluxos de caixa de (utilizados em) unidades operacionais</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashFlowsFromUsedInOperations" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CashFlowsFromUsedInOperations"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CashFlowsFromUsedInOperations" xlink:to="lab_ifrs-full_CashFlowsFromUsedInOperations" xlink:type="arc" order="1"/>
    <link:label id="lab_ctt_GanhosPerdasNoDesreconhecimentoDeInstrumentosFinanceirosMensuradosAoCustoAmortizado_label_pt" xlink:label="lab_ctt_GanhosPerdasNoDesreconhecimentoDeInstrumentosFinanceirosMensuradosAoCustoAmortizado" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Ganhos (Perdas) No Desreconhecimento De Instrumentos Financeiros Mensurados Ao Custo Amortizado</link:label>
    <link:label id="lab_ctt_GanhosPerdasNoDesreconhecimentoDeInstrumentosFinanceirosMensuradosAoCustoAmortizado_documentation_pt" xlink:label="lab_ctt_GanhosPerdasNoDesreconhecimentoDeInstrumentosFinanceirosMensuradosAoCustoAmortizado" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Ganhos (Perdas) No Desreconhecimento De Instrumentos Financeiros Mensurados Ao Custo Amortizado</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ctt_GanhosPerdasNoDesreconhecimentoDeInstrumentosFinanceirosMensuradosAoCustoAmortizado" xlink:href="002367-2021-12-31.xsd#ctt_GanhosPerdasNoDesreconhecimentoDeInstrumentosFinanceirosMensuradosAoCustoAmortizado"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctt_GanhosPerdasNoDesreconhecimentoDeInstrumentosFinanceirosMensuradosAoCustoAmortizado" xlink:to="lab_ctt_GanhosPerdasNoDesreconhecimentoDeInstrumentosFinanceirosMensuradosAoCustoAmortizado" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CashFlowsFromUsedInOperatingActivities_be1f353a-c453-4476-bf04-ce584c1e7b5a_totalLabel_pt" xlink:label="lab_ifrs-full_CashFlowsFromUsedInOperatingActivities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Fluxos de caixa de (utilizados em) atividades de exploração</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashFlowsFromUsedInOperatingActivities" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CashFlowsFromUsedInOperatingActivities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CashFlowsFromUsedInOperatingActivities" xlink:to="lab_ifrs-full_CashFlowsFromUsedInOperatingActivities" xlink:type="arc" order="1"/>
    <link:label id="lab_ctt_PagamentosAClientesBancarios_label_pt" xlink:label="lab_ctt_PagamentosAClientesBancarios" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Pagamentos A Clientes Bancarios</link:label>
    <link:label id="lab_ctt_PagamentosAClientesBancarios_documentation_pt" xlink:label="lab_ctt_PagamentosAClientesBancarios" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Pagamentos a clientes bancários</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ctt_PagamentosAClientesBancarios" xlink:href="002367-2021-12-31.xsd#ctt_PagamentosAClientesBancarios"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctt_PagamentosAClientesBancarios" xlink:to="lab_ctt_PagamentosAClientesBancarios" xlink:type="arc" order="1"/>
    <link:label id="lab_ctt_AumentoDiminuicaoNoPerimetroDeConsolidacao_label_pt" xlink:label="lab_ctt_AumentoDiminuicaoNoPerimetroDeConsolidacao" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Aumento (Diminuicao) No Perimetro De Consolidacao</link:label>
    <link:label id="lab_ctt_AumentoDiminuicaoNoPerimetroDeConsolidacao_documentation_pt" xlink:label="lab_ctt_AumentoDiminuicaoNoPerimetroDeConsolidacao" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Aumento (Diminuicao) No Perimetro De Consolidacao</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ctt_AumentoDiminuicaoNoPerimetroDeConsolidacao" xlink:href="002367-2021-12-31.xsd#ctt_AumentoDiminuicaoNoPerimetroDeConsolidacao"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctt_AumentoDiminuicaoNoPerimetroDeConsolidacao" xlink:to="lab_ctt_AumentoDiminuicaoNoPerimetroDeConsolidacao" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_EquityAndLiabilities_4ec2306a-b1c8-4a4b-8bd4-26acd43a3a96_totalLabel_pt" xlink:label="lab_ifrs-full_EquityAndLiabilities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Total equity and liabilities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_EquityAndLiabilities" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_EquityAndLiabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_EquityAndLiabilities" xlink:to="lab_ifrs-full_EquityAndLiabilities" xlink:type="arc" order="1"/>
  </link:labelLink>
</link:linkbase>
