| http://www.w3.org/ns/prov#value | - sents from one up to four substituents such as phenyl, alkyl preferably with from about 1 to about 12 carbon atoms, halogen atoms, cyano group, vinyl group, mercapto group, hydroxy group, amine group, carboxylic acid group, nitrile group, diazo group, nitro group, or azide group.
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