prov:value
| - epresent a hydrogen atom or alkyl group, and X is a hydrogen atom, alkyl group, aryl group, hydroxy group, halogen group, nitro group, amino group, amido group, alkyloxy group, aryloxy group, carboxyl group including an alkylcarboxyl group and arylcarboxyl group, alkyl carbonyl group, arylcarbonyl group, or carboxyalkyl group including an alkylcarboxyalkyl group and arylcarboxyalkyl group.
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