| prov:value
| - R1 --(CH2)n --CH2 --(NHR2)--COOH.HX, wherein R1 is selected from the group consisting of amine, amino alkane, guanidyl alkane, and phenyl alkyl, R2 is hydrogen or alkyl, and X is an anion; (c) those of the general formula H2 N--R--COOH, wherein R is selected from the group consisting of alkane, phenyl, benzyl, alkyl phenyl, phenyl dialkoxy, alkyl cycloalkane, phenol, aminophenyl, diamino phenyl, g
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