| http://www.w3.org/ns/prov#value | - R.sup.7 are selected independently from among H, NHOH, NH.sub.2, No.sub.2, pseudohalide, including N.sub.3, halide, alkenyl, alkynyl, aryl, heteroaryl, alkoxy, alkylamino, alkylthio, alkoxyalkyl,alkylsulfinyl, alkylsulfonyl, aryloxy, arylamino, arylthio, arylsulfinyl, arylsulfonyl, haloalkyl, haloaryl, alkoxycarbonyl, alkylcarbonyl, arylcarbonyl, formyl, substituted or unsubstituted amido, substi
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