| http://www.w3.org/ns/prov#value | - halogen atom, an NO.sub.2, OH, amidine, benzamidine, imidazole, alkoxy, (C1-C4) alkyl, NH2, CN, trihalomethyl, (C1-C4) acyloxy, (C1-C4) monoalkylamino, (C1-C4) dialkylamino, guanidino group,bis alkylated or bis acylated guanido group; Z.sub.a is NH, CH.sub.2, or O; B is a member selected from the group consisting of an alpha, beta or gamma amino acid residue; C is selected independently from memb
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