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  <xsd:element name="MaximumCommitmentAmount" id="smtk_MaximumCommitmentAmount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="credit" />
  <xsd:element name="MaximumShareIssuancePercentage" id="smtk_MaximumShareIssuancePercentage" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" />
  <xsd:element name="ThresholdPercentageOfVolumeWeightedAveragePrice" id="smtk_ThresholdPercentageOfVolumeWeightedAveragePrice" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" />
  <xsd:element name="DebtDiscountRelatedToNotesPayable" id="smtk_DebtDiscountRelatedToNotesPayable" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit" />
  <xsd:element name="FinancingOfDirectorsAndOfficersLiabilityInsuranceWithDebt" id="smtk_FinancingOfDirectorsAndOfficersLiabilityInsuranceWithDebt" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityNotePayableExchangeFeature" id="smtk_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityNotePayableExchangeFeature" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="DerivativeLiabilityAndPreferredStockMeasurementInput" id="smtk_DerivativeLiabilityAndPreferredStockMeasurementInput" type="xbrli:decimalItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" />
  <xsd:element name="PreferredStockMeasurementInput" id="smtk_PreferredStockMeasurementInput" type="xbrli:decimalItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" />
  <xsd:element name="LossOnEquityLineOfCredit" id="smtk_LossOnEquityLineOfCredit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="PrefundedWarrantMember" id="smtk_PrefundedWarrantMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="PurchaseAgreementMember" id="smtk_PurchaseAgreementMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="DebtInstrumentDiscountPercentage" id="smtk_DebtInstrumentDiscountPercentage" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" />
  <xsd:element name="AggregatePrincipalAfterDiscount" id="smtk_AggregatePrincipalAfterDiscount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="credit" />
  <xsd:element name="PreferredStockConvertibleConversionFloorPrice" id="smtk_PreferredStockConvertibleConversionFloorPrice" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" />
</xsd:schema>
