prov:value
| - e [1], [2], and [3], R<1> and R<2> are independently a hydrogen atom or alkyl group, R<3> is a group with a benzene ring, or an alkyl, alkenyl, or alkynyl group having 1 to 6 carbon atoms, 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 an arylcarbo
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