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    <element id="SINT_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityExerciseOfWarrants" name="FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityExerciseOfWarrants" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="SINT_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPeriodOther" name="FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPeriodOther" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="SINT_AccruedPayableCurrent" name="AccruedPayableCurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="SINT_UpFrontInsurancePremium" name="UpFrontInsurancePremium" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="SINT_FinancedInsurancePremium" name="FinancedInsurancePremium" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="SINT_ReimbursementOfExpensesAndLegalFees" name="ReimbursementOfExpensesAndLegalFees" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="SINT_SharebasedCompensationArrangementByGrantedSharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2" name="SharebasedCompensationArrangementByGrantedSharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2" nillable="true" xbrli:periodType="duration" type="xbrli:durationItemType" substitutionGroup="xbrli:item" />
    <element id="SINT_DeferredTaxAssetsCapitalizedResearchExpenses" name="DeferredTaxAssetsCapitalizedResearchExpenses" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="SINT_DeferredTaxAssetsRightOfUseAsset" name="DeferredTaxAssetsRightOfUseAsset" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="SINT_ResearchAndDevelopmentTaxCredits" name="ResearchAndDevelopmentTaxCredits" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="SINT_EffectiveIncomeTaxRateReconciliationResearchAndDevelopmentTaxCredits" name="EffectiveIncomeTaxRateReconciliationResearchAndDevelopmentTaxCredits" nillable="true" xbrli:periodType="duration" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" />
    <element id="SINT_IncomeTaxReconciliationChangeInValueWarrants" name="IncomeTaxReconciliationChangeInValueWarrants" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="SINT_EffectiveIncomeTaxRateReconciliationChangeInValueWarrants" name="EffectiveIncomeTaxRateReconciliationChangeInValueWarrants" nillable="true" xbrli:periodType="duration" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" />
    <element id="SINT_IncomeTaxReconciliationChangeInUnrecognizedTaxBenefits" name="IncomeTaxReconciliationChangeInUnrecognizedTaxBenefits" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="SINT_EffectiveIncomeTaxRateReconciliationChangeInUnrecognizedTaxBenefits" name="EffectiveIncomeTaxRateReconciliationChangeInUnrecognizedTaxBenefits" nillable="true" xbrli:periodType="duration" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" />
    <element id="SINT_IncomeTaxReconciliationDeferredAdjustments" name="IncomeTaxReconciliationDeferredAdjustments" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="SINT_EffectiveIncomeTaxRateReconciliationNondeductibleDeferredAdjustments" name="EffectiveIncomeTaxRateReconciliationNondeductibleDeferredAdjustments" nillable="true" xbrli:periodType="duration" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" />
    <element id="SINT_StatementOfFinancialPositionLocationBalanceAxis" name="StatementOfFinancialPositionLocationBalanceAxis" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrldt:dimensionItem" />
    <element id="SINT_StatementOfFinancialPositionLocationBalanceDomain" name="StatementOfFinancialPositionLocationBalanceDomain" abstract="true" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="SINT_PaymentOfResearchFund" name="PaymentOfResearchFund" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="SINT_ResearchFundRemainingPrepaidBalance" name="ResearchFundRemainingPrepaidBalance" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="SINT_PublicOfferingUnits" name="PublicOfferingUnits" nillable="true" xbrli:periodType="instant" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="SINT_TwoThousandTwentyThreeRegisteredOfferingMember" name="TwoThousandTwentyThreeRegisteredOfferingMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="SINT_ClassCAndClassDWarrantsMember" name="ClassCAndClassDWarrantsMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="SINT_ClassDWarrantMember" name="ClassDWarrantMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="SINT_ClassCWarrantMember" name="ClassCWarrantMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="SINT_ProceedsFromIssuanceOfCommonStockAndPrefundedWarrants" name="ProceedsFromIssuanceOfCommonStockAndPrefundedWarrants" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="SINT_CommonStockAndPrefundedWarrantsMember" name="CommonStockAndPrefundedWarrantsMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="SINT_ProceedsAllocatedToDerivativeLiabilities" name="ProceedsAllocatedToDerivativeLiabilities" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="SINT_DerivativeLiabilitiesForCommonStockWarrantsMember" name="DerivativeLiabilitiesForCommonStockWarrantsMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="SINT_AgentWarrantOfferingMember" name="AgentWarrantOfferingMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="SINT_ScheduleOfUSFederalStatutoryRateAndTaxesTableTextBlock" name="ScheduleOfUSFederalStatutoryRateAndTaxesTableTextBlock" nillable="true" xbrli:periodType="duration" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" />
    <element id="SINT_IncomeTaxReconciliationDeferredTaxAdjustments" name="IncomeTaxReconciliationDeferredTaxAdjustments" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="SINT_IncomeTaxReconciliationIncomeTaxExpenseStateTaxExpenseFederalBenefi" name="IncomeTaxReconciliationIncomeTaxExpenseStateTaxExpenseFederalBenefi" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
</schema>
