| http://www.w3.org/ns/prov#value | - ible in the organism to mercapto group;R.sub.1 and R.sub.2, the same or different, are a hydrogen atom, a straight or branched C.sub.1 -C.sub.6 alkyl group, an aryl or an arylalkyl group having from 1 to 6 carbon atoms in the alkyl moiety wherein the aryl is a phenyl, a biphenyl, anaphthyl or a 5 or 6 membered aromatic heterocycle
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