| http://www.w3.org/ns/prov#value | - R12 is H, lower alkyl, --COOR13, --CN, --Cl, --Br, --I, --NO2, --SO2 R13, --PO3 (R13)2, --C(O)N(R13)2, --SO2 N(R13)2 wherein R13 is independently H, an organic radical including signal or modulating groups, alkyl, carboxyalkyl, amino-substituted lower alkyl, N(lower alkyl)2 or NH(lower alkyl); and
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