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<!--Generated by DFIN XBRL Instance Document - http://www.dfinsolutions.com/ - Version R3.0 - on 23-September-2026 [07:42:24] {PM}-->
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          <link:loc xlink:type="locator" xlink:href="cik0001190935-20260924.xsd#cik0001190935_SyntheticConvertibleSecuritiesRiskMember" xlink:label="loc_cik0001190935_SyntheticConvertibleSecuritiesRiskMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001190935_SyntheticConvertibleSecuritiesRiskMember" xml:lang="en-US">Synthetic Convertible Securities Risk [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001190935_SyntheticConvertibleSecuritiesRiskMember" xlink:to="lab_cik0001190935_SyntheticConvertibleSecuritiesRiskMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001190935-20260924.xsd#cik0001190935_ContingentConvertibleSecuritiesRiskMember" xlink:label="loc_cik0001190935_ContingentConvertibleSecuritiesRiskMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001190935_ContingentConvertibleSecuritiesRiskMember" xml:lang="en-US">Contingent Convertible Securities Risk [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001190935_ContingentConvertibleSecuritiesRiskMember" xlink:to="lab_cik0001190935_ContingentConvertibleSecuritiesRiskMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001190935-20260924.xsd#cik0001190935_ValuationRiskMember" xlink:label="loc_cik0001190935_ValuationRiskMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001190935_ValuationRiskMember" xml:lang="en-US">Valuation Risk [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001190935_ValuationRiskMember" xlink:to="lab_cik0001190935_ValuationRiskMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001190935-20260924.xsd#cik0001190935_RealEstateRiskMember" xlink:label="loc_cik0001190935_RealEstateRiskMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001190935_RealEstateRiskMember" xml:lang="en-US">Real Estate Risk [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001190935_RealEstateRiskMember" xlink:to="lab_cik0001190935_RealEstateRiskMember" />
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          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001190935_LeverageRiskMember" xml:lang="en-US">Leverage Risk [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001190935_LeverageRiskMember" xlink:to="lab_cik0001190935_LeverageRiskMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001190935-20260924.xsd#cik0001190935_SmallerCompanyRiskMember" xlink:label="loc_cik0001190935_SmallerCompanyRiskMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001190935_SmallerCompanyRiskMember" xml:lang="en-US">Smaller Company Risk [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001190935_SmallerCompanyRiskMember" xlink:to="lab_cik0001190935_SmallerCompanyRiskMember" />
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          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001190935_DerivativesRiskMember" xml:lang="en-US">Derivatives Risk [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001190935_DerivativesRiskMember" xlink:to="lab_cik0001190935_DerivativesRiskMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001190935-20260924.xsd#cik0001190935_CreditDefaultSwapsRiskMember" xlink:label="loc_cik0001190935_CreditDefaultSwapsRiskMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001190935_CreditDefaultSwapsRiskMember" xml:lang="en-US">Credit Default Swaps Risk [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001190935_CreditDefaultSwapsRiskMember" xlink:to="lab_cik0001190935_CreditDefaultSwapsRiskMember" />
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          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001190935_CounterpartyRiskMember" xml:lang="en-US">Counterparty Risk [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001190935_CounterpartyRiskMember" xlink:to="lab_cik0001190935_CounterpartyRiskMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001190935-20260924.xsd#cik0001190935_RepurchaseAgreementsRiskMember" xlink:label="loc_cik0001190935_RepurchaseAgreementsRiskMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001190935_RepurchaseAgreementsRiskMember" xml:lang="en-US">Repurchase Agreements Risk [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001190935_RepurchaseAgreementsRiskMember" xlink:to="lab_cik0001190935_RepurchaseAgreementsRiskMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001190935-20260924.xsd#cik0001190935_CollateralizedBondObligationsCollateralizedLoanObligationsandCollateralizedDebtObligationsRiskMember" xlink:label="loc_cik0001190935_CollateralizedBondObligationsCollateralizedLoanObligationsandCollateralizedDebtObligationsRiskMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001190935_CollateralizedBondObligationsCollateralizedLoanObligationsandCollateralizedDebtObligationsRiskMember" xml:lang="en-US">Collateralized Bond Obligations, Collateralized Loan Obligations and Collateralized Debt Obligations Risk [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001190935_CollateralizedBondObligationsCollateralizedLoanObligationsandCollateralizedDebtObligationsRiskMember" xlink:to="lab_cik0001190935_CollateralizedBondObligationsCollateralizedLoanObligationsandCollateralizedDebtObligationsRiskMember" />
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          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001190935_EquitySecuritiesandRelatedMarketRiskMember" xlink:to="lab_cik0001190935_EquitySecuritiesandRelatedMarketRiskMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001190935-20260924.xsd#cik0001190935_PreferredSecuritiesRiskMember" xlink:label="loc_cik0001190935_PreferredSecuritiesRiskMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001190935_PreferredSecuritiesRiskMember" xml:lang="en-US">Preferred Securities Risk [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001190935_PreferredSecuritiesRiskMember" xlink:to="lab_cik0001190935_PreferredSecuritiesRiskMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001190935-20260924.xsd#cik0001190935_InsuranceLinkedandOtherInstrumentsRiskMember" xlink:label="loc_cik0001190935_InsuranceLinkedandOtherInstrumentsRiskMember" />
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          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001190935_InsuranceLinkedandOtherInstrumentsRiskMember" xlink:to="lab_cik0001190935_InsuranceLinkedandOtherInstrumentsRiskMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001190935-20260924.xsd#cik0001190935_PrivatePlacementsandRestrictedSecuritiesRiskMember" xlink:label="loc_cik0001190935_PrivatePlacementsandRestrictedSecuritiesRiskMember" />
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          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001190935_PrivatePlacementsandRestrictedSecuritiesRiskMember" xlink:to="lab_cik0001190935_PrivatePlacementsandRestrictedSecuritiesRiskMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001190935-20260924.xsd#cik0001190935_SecuritiesLendingRiskMember" xlink:label="loc_cik0001190935_SecuritiesLendingRiskMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001190935_SecuritiesLendingRiskMember" xml:lang="en-US">Securities Lending Risk [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001190935_SecuritiesLendingRiskMember" xlink:to="lab_cik0001190935_SecuritiesLendingRiskMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001190935-20260924.xsd#cik0001190935_InflationDeflationRiskMember" xlink:label="loc_cik0001190935_InflationDeflationRiskMember" />
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          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001190935_InflationDeflationRiskMember" xlink:to="lab_cik0001190935_InflationDeflationRiskMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001190935-20260924.xsd#cik0001190935_RegulatoryChangesRiskMember" xlink:label="loc_cik0001190935_RegulatoryChangesRiskMember" />
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          <link:loc xlink:type="locator" xlink:href="cik0001190935-20260924.xsd#cik0001190935_RegulatoryRiskCommodityPoolOperatorMember" xlink:label="loc_cik0001190935_RegulatoryRiskCommodityPoolOperatorMember" />
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          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001190935_RegulatoryRiskCommodityPoolOperatorMember" xlink:to="lab_cik0001190935_RegulatoryRiskCommodityPoolOperatorMember" />
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          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001190935_LiquidityRiskMember" xml:lang="en-US">Liquidity Risk [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001190935_LiquidityRiskMember" xlink:to="lab_cik0001190935_LiquidityRiskMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001190935-20260924.xsd#cik0001190935_StructuredInvestmentsRiskMember" xlink:label="loc_cik0001190935_StructuredInvestmentsRiskMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001190935_StructuredInvestmentsRiskMember" xml:lang="en-US">Structured Investments Risk [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001190935_StructuredInvestmentsRiskMember" xlink:to="lab_cik0001190935_StructuredInvestmentsRiskMember" />
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          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001190935_PortfolioTurnoverRiskMember" xml:lang="en-US">Portfolio Turnover Risk [Member]</link:label>
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          <link:loc xlink:type="locator" xlink:href="cik0001190935-20260924.xsd#cik0001190935_OtherInvestmentCompaniesRiskMember" xlink:label="loc_cik0001190935_OtherInvestmentCompaniesRiskMember" />
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      </link:linkbase>
    </appinfo>
  </annotation>
  <import namespace="http://xbrl.sec.gov/cef/2026" schemaLocation="https://xbrl.sec.gov/cef/2026/cef-2026.xsd" />
  <import namespace="http://xbrl.sec.gov/cef-pre/2026" schemaLocation="https://xbrl.sec.gov/cef/2026/cef-2026_pre.xsd" />
  <import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd" />
  <import namespace="http://xbrl.org/2005/xbrldt" schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd" />
  <import namespace="http://www.xbrl.org/dtr/type/2024-01-31" schemaLocation="https://www.xbrl.org/dtr/type/2024-01-31/types.xsd" />
  <import namespace="http://xbrl.sec.gov/dei/2026" schemaLocation="https://xbrl.sec.gov/dei/2026/dei-2026.xsd" />
  <import namespace="http://www.xbrl.org/2003/linkbase" schemaLocation="http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" />
  <import namespace="http://www.xbrl.org/dtr/type/2020-01-21" schemaLocation="https://www.xbrl.org/dtr/type/2020-01-21/types.xsd" />
  <element name="MarketDiscountRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001190935_MarketDiscountRiskMember" substitutionGroup="xbrli:item" />
  <element name="MarketRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001190935_MarketRiskMember" substitutionGroup="xbrli:item" />
  <element name="AssetAllocationRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001190935_AssetAllocationRiskMember" substitutionGroup="xbrli:item" />
  <element name="ManagementRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001190935_ManagementRiskMember" substitutionGroup="xbrli:item" />
  <element name="IssuerRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001190935_IssuerRiskMember" substitutionGroup="xbrli:item" />
  <element name="CreditRisksMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001190935_CreditRisksMember" substitutionGroup="xbrli:item" />
  <element name="MortgageRelatedandOtherAssetBackedInstrumentsRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001190935_MortgageRelatedandOtherAssetBackedInstrumentsRiskMember" substitutionGroup="xbrli:item" />
  <element name="MortgageRelatedDerivativeInstrumentsRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001190935_MortgageRelatedDerivativeInstrumentsRiskMember" substitutionGroup="xbrli:item" />
  <element name="PrivatelyIssuedMortgageRelatedSecuritiesRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001190935_PrivatelyIssuedMortgageRelatedSecuritiesRiskMember" substitutionGroup="xbrli:item" />
  <element name="HighYieldSecuritiesRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001190935_HighYieldSecuritiesRiskMember" substitutionGroup="xbrli:item" />
  <element name="MunicipalBondRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001190935_MunicipalBondRiskMember" substitutionGroup="xbrli:item" />
  <element name="DistressedandDefaultedSecuritiesRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001190935_DistressedandDefaultedSecuritiesRiskMember" substitutionGroup="xbrli:item" />
  <element name="InflationindexedSecurityRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001190935_InflationindexedSecurityRiskMember" substitutionGroup="xbrli:item" />
  <element name="DebtSecuritiesRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001190935_DebtSecuritiesRiskMember" substitutionGroup="xbrli:item" />
  <element name="SovereignDebtRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001190935_SovereignDebtRiskMember" substitutionGroup="xbrli:item" />
  <element name="SeniorDebtRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001190935_SeniorDebtRiskMember" substitutionGroup="xbrli:item" />
  <element name="ZeroCouponBondsStepUpsandPaymentInKindSecuritiesRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001190935_ZeroCouponBondsStepUpsandPaymentInKindSecuritiesRiskMember" substitutionGroup="xbrli:item" />
  <element name="LoansandOtherIndebtednessLoanAcquisitionsParticipationsandAssignmentsRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001190935_LoansandOtherIndebtednessLoanAcquisitionsParticipationsandAssignmentsRiskMember" substitutionGroup="xbrli:item" />
  <element name="LoanOriginationRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001190935_LoanOriginationRiskMember" substitutionGroup="xbrli:item" />
  <element name="ForeignLoanOriginationsRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001190935_ForeignLoanOriginationsRiskMember" substitutionGroup="xbrli:item" />
  <element name="CovenantliteObligationsRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001190935_CovenantliteObligationsRiskMember" substitutionGroup="xbrli:item" />
  <element name="SubprimeRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001190935_SubprimeRiskMember" substitutionGroup="xbrli:item" />
  <element name="ReinvestmentRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001190935_ReinvestmentRiskMember" substitutionGroup="xbrli:item" />
  <element name="CallRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001190935_CallRiskMember" substitutionGroup="xbrli:item" />
  <element name="ForeignNonUSInvestmentRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001190935_ForeignNonUSInvestmentRiskMember" substitutionGroup="xbrli:item" />
  <element name="EmergingMarketsRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001190935_EmergingMarketsRiskMember" substitutionGroup="xbrli:item" />
  <element name="CurrencyRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001190935_CurrencyRiskMember" substitutionGroup="xbrli:item" />
  <element name="USGovernmentSecuritiesRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001190935_USGovernmentSecuritiesRiskMember" substitutionGroup="xbrli:item" />
  <element name="ConvertibleSecuritiesRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001190935_ConvertibleSecuritiesRiskMember" substitutionGroup="xbrli:item" />
  <element name="SyntheticConvertibleSecuritiesRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001190935_SyntheticConvertibleSecuritiesRiskMember" substitutionGroup="xbrli:item" />
  <element name="ContingentConvertibleSecuritiesRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001190935_ContingentConvertibleSecuritiesRiskMember" substitutionGroup="xbrli:item" />
  <element name="ValuationRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001190935_ValuationRiskMember" substitutionGroup="xbrli:item" />
  <element name="RealEstateRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001190935_RealEstateRiskMember" substitutionGroup="xbrli:item" />
  <element name="LeverageRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001190935_LeverageRiskMember" substitutionGroup="xbrli:item" />
  <element name="SmallerCompanyRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001190935_SmallerCompanyRiskMember" substitutionGroup="xbrli:item" />
  <element name="DerivativesRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001190935_DerivativesRiskMember" substitutionGroup="xbrli:item" />
  <element name="CreditDefaultSwapsRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001190935_CreditDefaultSwapsRiskMember" substitutionGroup="xbrli:item" />
  <element name="CounterpartyRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001190935_CounterpartyRiskMember" substitutionGroup="xbrli:item" />
  <element name="RepurchaseAgreementsRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001190935_RepurchaseAgreementsRiskMember" substitutionGroup="xbrli:item" />
  <element name="CollateralizedBondObligationsCollateralizedLoanObligationsandCollateralizedDebtObligationsRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001190935_CollateralizedBondObligationsCollateralizedLoanObligationsandCollateralizedDebtObligationsRiskMember" substitutionGroup="xbrli:item" />
  <element name="EquitySecuritiesandRelatedMarketRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001190935_EquitySecuritiesandRelatedMarketRiskMember" substitutionGroup="xbrli:item" />
  <element name="PreferredSecuritiesRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001190935_PreferredSecuritiesRiskMember" substitutionGroup="xbrli:item" />
  <element name="InsuranceLinkedandOtherInstrumentsRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001190935_InsuranceLinkedandOtherInstrumentsRiskMember" substitutionGroup="xbrli:item" />
  <element name="PrivatePlacementsandRestrictedSecuritiesRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001190935_PrivatePlacementsandRestrictedSecuritiesRiskMember" substitutionGroup="xbrli:item" />
  <element name="SecuritiesLendingRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001190935_SecuritiesLendingRiskMember" substitutionGroup="xbrli:item" />
  <element name="InflationDeflationRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001190935_InflationDeflationRiskMember" substitutionGroup="xbrli:item" />
  <element name="RegulatoryChangesRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001190935_RegulatoryChangesRiskMember" substitutionGroup="xbrli:item" />
  <element name="RegulatoryRiskCommodityPoolOperatorMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001190935_RegulatoryRiskCommodityPoolOperatorMember" substitutionGroup="xbrli:item" />
  <element name="LiquidityRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001190935_LiquidityRiskMember" substitutionGroup="xbrli:item" />
  <element name="StructuredInvestmentsRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001190935_StructuredInvestmentsRiskMember" substitutionGroup="xbrli:item" />
  <element name="TaxRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001190935_TaxRiskMember" substitutionGroup="xbrli:item" />
  <element name="PortfolioTurnoverRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001190935_PortfolioTurnoverRiskMember" substitutionGroup="xbrli:item" />
  <element name="OperationalRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001190935_OperationalRiskMember" substitutionGroup="xbrli:item" />
  <element name="OtherInvestmentCompaniesRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001190935_OtherInvestmentCompaniesRiskMember" substitutionGroup="xbrli:item" />
  <element name="PrivacyandDataSecurityRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001190935_PrivacyandDataSecurityRiskMember" substitutionGroup="xbrli:item" />
  <element name="ConfidentialInformationAccessRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001190935_ConfidentialInformationAccessRiskMember" substitutionGroup="xbrli:item" />
  <element name="CyberSecurityRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001190935_CyberSecurityRiskMember" substitutionGroup="xbrli:item" />
  <element name="PotentialConflictsofInterestRiskAllocationofInvestmentOpportunitiesMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001190935_PotentialConflictsofInterestRiskAllocationofInvestmentOpportunitiesMember" substitutionGroup="xbrli:item" />
  <element name="MarketDisruptionsRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001190935_MarketDisruptionsRiskMember" substitutionGroup="xbrli:item" />
  <element name="FocusedInvestmentRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001190935_FocusedInvestmentRiskMember" substitutionGroup="xbrli:item" />
  <element name="CertainAffiliationsMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001190935_CertainAffiliationsMember" substitutionGroup="xbrli:item" />
  <element name="AntiTakeoverProvisionsMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001190935_AntiTakeoverProvisionsMember" substitutionGroup="xbrli:item" />
  <element name="FundDistributionRatesMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001190935_FundDistributionRatesMember" substitutionGroup="xbrli:item" />
  <element name="CommonSharesMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001190935_CommonSharesMember" substitutionGroup="xbrli:item" />
</schema>
