| http://www.w3.org/ns/prov#value | - optionally substituted monocyclic or bicyclic heteroaryl group and Z is a bond, an atom --O--, or --S-- or a group --N(Rb)-- and n is zero or the integer 1, 2, 3 or 4; R3 is a hydrogen atom, or an optionally substituted alkyl, alkenyl, alkynyl, --C(O)R4 (where R4 is an amino, alkylamino, arylamino, alkoxy, aryloxy or an optionally substituted alkyl group) or --C(S)R4 group; and the salts, solvate
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