xPath Help

<root>
< CUSIP_XML>
  <McoOrgId>600024535</McoOrgId>
  <CUSIP>794743GU2</CUSIP>
  <MaturityDate>19851201</MaturityDate>
  <SalesDescription>General Obligation</SalesDescription>
  <org_role>obligor</org_role>
< /CUSIP_XML>
< /root>

I have been trying to create an xpath that I can type in the CUSIP (794743GU2) and have the xpath return the McoOrgID (600024535). Can someone please help with the xpath creation.