<?xml version="1.0"?>
<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 http://www.w3.org/1999/xlink http://www.xbrl.org/2003/xlink-2003-12-31.xsd">
  <link:roleRef xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/net-2009-12-16.xsd#netLabel" roleURI="http://www.xbrl.org/2009/role/netLabel" />
  <link:labelLink xlink:role="http://www.xbrl.org/2003/role/link" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="AdjustmentsDepreciationOfRightOfUseAssets" xlink:href="ose-2025-12-31.xsd#ose_AdjustmentsDepreciationOfRightOfUseAssets" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="AdjustmentsDepreciationOfRightOfUseAssets_label_labelen" xml:lang="en">Adjustments Depreciation Of Right Of Use Assets</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="AdjustmentsDepreciationOfRightOfUseAssets" xlink:to="AdjustmentsDepreciationOfRightOfUseAssets_label_labelen" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:label="AdjustmentsInTaxAndSocialLiabilities" xlink:href="ose-2025-12-31.xsd#ose_AdjustmentsInTaxAndSocialLiabilities" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="AdjustmentsInTaxAndSocialLiabilities_label_labelen" xml:lang="en">Adjustments In Tax And Social Liabilities</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="AdjustmentsInTaxAndSocialLiabilities" xlink:to="AdjustmentsInTaxAndSocialLiabilities_label_labelen" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:label="AdjustmentsInTaxReceivablesAndPayables" xlink:href="ose-2025-12-31.xsd#ose_AdjustmentsInTaxReceivablesAndPayables" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="AdjustmentsInTaxReceivablesAndPayables_label_labelen" xml:lang="en">Adjustments In Tax Receivables And Payables</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="AdjustmentsInTaxReceivablesAndPayables" xlink:to="AdjustmentsInTaxReceivablesAndPayables_label_labelen" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:label="CapitalIncrease" xlink:href="ose-2025-12-31.xsd#ose_CapitalIncrease" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CapitalIncrease_label_labelen" xml:lang="en">Capital Increase</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CapitalIncrease" xlink:to="CapitalIncrease_label_labelen" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:label="CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition_periodEndLabel_labelen" xml:lang="en">Cash And Cash Equivalents If Different From Statement Of Financial Position</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition" xlink:to="CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition_periodEndLabel_labelen" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition_periodStartLabel_labelen" xml:lang="en">Cash And Cash Equivalents If Different From Statement Of Financial Position</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition" xlink:to="CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition_periodStartLabel_labelen" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:label="CashFlowsFromUsedInOperationsBeforeChangesInWorkingCapital" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_CashFlowsFromUsedInOperationsBeforeChangesInWorkingCapital" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="CashFlowsFromUsedInOperationsBeforeChangesInWorkingCapital_totalLabel_labelen" xml:lang="en">Cash Flows From Used In Operations Before Changes In Working Capital</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CashFlowsFromUsedInOperationsBeforeChangesInWorkingCapital" xlink:to="CashFlowsFromUsedInOperationsBeforeChangesInWorkingCapital_totalLabel_labelen" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:label="ChangeInFinancialFixedAssets" xlink:href="ose-2025-12-31.xsd#ose_ChangeInFinancialFixedAssets" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ChangeInFinancialFixedAssets_label_labelen" xml:lang="en">Change In Financial Fixed Assets</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ChangeInFinancialFixedAssets" xlink:to="ChangeInFinancialFixedAssets_label_labelen" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:label="ChangeInRightOfUseAssets" xlink:href="ose-2025-12-31.xsd#ose_ChangeInRightOfUseAssets" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ChangeInRightOfUseAssets_label_labelen" xml:lang="en">Change In Right Of Use Assets</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ChangeInRightOfUseAssets" xlink:to="ChangeInRightOfUseAssets_label_labelen" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:label="ChangeInWorkingCapitalRequirementExcludingReceivablesAndTaxLiabilities" xlink:href="ose-2025-12-31.xsd#ose_ChangeInWorkingCapitalRequirementExcludingReceivablesAndTaxLiabilities" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ChangeInWorkingCapitalRequirementExcludingReceivablesAndTaxLiabilities_label_labelen" xml:lang="en">Change In Working Capital Requirement Excluding Receivables And Tax Liabilities</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ChangeInWorkingCapitalRequirementExcludingReceivablesAndTaxLiabilities" xlink:to="ChangeInWorkingCapitalRequirementExcludingReceivablesAndTaxLiabilities_label_labelen" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="ChangeInWorkingCapitalRequirementExcludingReceivablesAndTaxLiabilities_totalLabel_labelen" xml:lang="en">Change In Working Capital Requirement Excluding Receivables And Tax Liabilities</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ChangeInWorkingCapitalRequirementExcludingReceivablesAndTaxLiabilities" xlink:to="ChangeInWorkingCapitalRequirementExcludingReceivablesAndTaxLiabilities_totalLabel_labelen" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:label="ChangesInCashAndCashEquivalentsIfDifferentFromStatementOfFinancialPositionAbstract" xlink:href="ose-2025-12-31.xsd#ose_ChangesInCashAndCashEquivalentsIfDifferentFromStatementOfFinancialPositionAbstract" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ChangesInCashAndCashEquivalentsIfDifferentFromStatementOfFinancialPositionAbstract_label_labelen" xml:lang="en">Changes In Cash And Cash Equivalents If Different From Statement Of Financial Position Abstract</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ChangesInCashAndCashEquivalentsIfDifferentFromStatementOfFinancialPositionAbstract" xlink:to="ChangesInCashAndCashEquivalentsIfDifferentFromStatementOfFinancialPositionAbstract_label_labelen" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:label="ConsolidatedReservesAndIncomeMember" xlink:href="ose-2025-12-31.xsd#ose_ConsolidatedReservesAndIncomeMember" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ConsolidatedReservesAndIncomeMember_label_labelen" xml:lang="en">Consolidated Reserves And Income Member</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ConsolidatedReservesAndIncomeMember" xlink:to="ConsolidatedReservesAndIncomeMember_label_labelen" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:label="CurrentOperatingIncome" xlink:href="ose-2025-12-31.xsd#ose_CurrentOperatingIncome" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CurrentOperatingIncome_label_labelen" xml:lang="en">Current Operating Income</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CurrentOperatingIncome" xlink:to="CurrentOperatingIncome_label_labelen" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="CurrentOperatingIncome_totalLabel_labelen" xml:lang="en">Current Operating Income</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CurrentOperatingIncome" xlink:to="CurrentOperatingIncome_totalLabel_labelen" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:label="ExcerciceBPCEBsa" xlink:href="ose-2025-12-31.xsd#ose_ExcerciceBPCEBsa" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ExcerciceBPCEBsa_label_labelen" xml:lang="en">Excercice Bp C e Bsa</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ExcerciceBPCEBsa" xlink:to="ExcerciceBPCEBsa_label_labelen" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:label="ExcerciceBsaVester" xlink:href="ose-2025-12-31.xsd#ose_ExcerciceBsaVester" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ExcerciceBsaVester_label_labelen" xml:lang="en">Exercise Base Vester</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ExcerciceBsaVester" xlink:to="ExcerciceBsaVester_label_labelen" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:label="FinanceIncomeCost" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_FinanceIncomeCost" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="FinanceIncomeCost_totalLabel_labelen" xml:lang="en">Finance Income Cost</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="FinanceIncomeCost" xlink:to="FinanceIncomeCost_totalLabel_labelen" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:label="FinancingCapacityAfterNetFinancialDebtCost" xlink:href="ose-2025-12-31.xsd#ose_FinancingCapacityAfterNetFinancialDebtCost" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="FinancingCapacityAfterNetFinancialDebtCost_label_labelen" xml:lang="en">Financing Capacity After Net Financial Debt Cost</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="FinancingCapacityAfterNetFinancialDebtCost" xlink:to="FinancingCapacityAfterNetFinancialDebtCost_label_labelen" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="FinancingCapacityAfterNetFinancialDebtCost_totalLabel_labelen" xml:lang="en">Financing Capacity After Net Financial Debt Cost</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="FinancingCapacityAfterNetFinancialDebtCost" xlink:to="FinancingCapacityAfterNetFinancialDebtCost_totalLabel_labelen" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:label="NetDepreciationAndAmortization" xlink:href="ose-2025-12-31.xsd#ose_NetDepreciationAndAmortization" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="NetDepreciationAndAmortization_label_labelen" xml:lang="en">Net Depreciation And Amortization</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="NetDepreciationAndAmortization" xlink:to="NetDepreciationAndAmortization_label_labelen" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:label="OtherDebtsAndAccruals" xlink:href="ose-2025-12-31.xsd#ose_OtherDebtsAndAccruals" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OtherDebtsAndAccruals_label_labelen" xml:lang="en">Other debts and accruals</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OtherDebtsAndAccruals" xlink:to="OtherDebtsAndAccruals_label_labelen" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:label="ReconnaissanceDuCAImpactEffimune" xlink:href="ose-2025-12-31.xsd#ose_ReconnaissanceDuCAImpactEffimune" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ReconnaissanceDuCAImpactEffimune_label_labelen" xml:lang="en">Reconnaissance Du C A Impact Effimune</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ReconnaissanceDuCAImpactEffimune" xlink:to="ReconnaissanceDuCAImpactEffimune_label_labelen" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:label="ReservesAndRetainedEarnings" xlink:href="ose-2025-12-31.xsd#ose_ReservesAndRetainedEarnings" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ReservesAndRetainedEarnings_label_labelen" xml:lang="en">Reserves And Retained Earnings</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ReservesAndRetainedEarnings" xlink:to="ReservesAndRetainedEarnings_label_labelen" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:label="ShorttermDepositsClassifiedAsInvestingActivities" xlink:href="ose-2025-12-31.xsd#ose_ShorttermDepositsClassifiedAsInvestingActivities" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ShorttermDepositsClassifiedAsInvestingActivities_label_labelen" xml:lang="en">Shortterm Deposits Classified As Investing Activities</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ShorttermDepositsClassifiedAsInvestingActivities" xlink:to="ShorttermDepositsClassifiedAsInvestingActivities_label_labelen" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:label="SouscriptionBsa" xlink:href="ose-2025-12-31.xsd#ose_SouscriptionBsa" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="SouscriptionBsa_label_labelen" xml:lang="en">Souscription Bsa</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="SouscriptionBsa" xlink:to="SouscriptionBsa_label_labelen" xlink:type="arc" />
  </link:labelLink>
</link:linkbase>