| http://www.w3.org/ns/prov#value | - alkyl or heteroaryl-C1-C2 alkyl radical; wherein the aryl and heteroaryl radicals are optionally substituted by 1-2 radicals of hydroxy, C1-C4 alkoxy, C1-C4 alkylthiol, amino, C1-C4 alkylamino, di(C1-C4 alkyl)amino, acetylamino, cyano, halo, azido, C1-C4 alkyl, trifluoromethyl or trifluoromethoxy; and R2 is a hydrogen or C1-C2 alkyl radical; R3 is an aryl or heteroaryl radical which is optionally
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