| http://www.w3.org/ns/prov#value | - where R1 is alkyl, cycloalkyl, aryl, alkaryl, aralkyl, alkoxy, aryloxy or nitrogen containing heterocyclic radical and R2, R3 and R4 are hydrogen or the same as R1, and at least one of R1, R2, R3, R4 is hydrogen, said alkyl radicals including the alkyl portion of the alkaryl radical, cycloalkyl are aralkyl and alkoxy radicals containing from one to about ten carbon atoms including the isomeric con
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