| http://www.w3.org/ns/prov#value | - onal linker group and R3 is selected from groups which are or which comprise one of a nitrile group, an alcohol, an ester, an ether, an amine and an alkene, provided that when R3 is or comprises an alcohol, L is present; and wherein the A ring of the steroidal ring system is substituted at position 2 or 4 with a group R4, wherein R4 is a hydrocarbyl group.
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