| http://www.w3.org/ns/prov#value | - X1 is an ???O??? or ???S???O atom or a group selected from ???C(O)???, ???C(S)???, ???S(O)???, ???S(O)2???, ???C(R5)(R6)??? {where R5 is a hydrogen atom or an optionally substituted straight or branched alkyl group and R6 is a hydrogen or halogen atom or a straight or branched alkyl, haloalkyl, alkoxy, haloalkoxy, alkylthio, aromatic, heteroaromatic, or ???(Alk1)mR7 group [in which Alk1 is a C1-3a
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