prov:value
| - of from one to two; R is a member selected from the class consisting of a hydrogen, and an alkyl group; R is a member selected from the class consisting of an alkyl, aryl and a heterocyclic group; R, is a member selected from the class consisting of a hydrogen, alkyl, aryl and a heterocyclic group; R is a member selected from the class consisting of a hydrogen, alkyl, aryl, heterocyclic, amino, ca
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