prov:value
| - R1 represents hydrogen atom, alkyl, alkenyl, alkynyl, aryl, arylalkyl, heteroaryl, heteroarylalkyl, cycloalkyl, or cycloalkylalkyl; each group of R1, except hydrogen atom, may be substituted or unsubstituted with alkylamino, amino, hydroxy, alkoxy, carboxy, alkoxycarbonyl, acyl, acyloxy, acylthio, mercapto, alkylthio, alkylsulfinyl or alkylsulfonyl; each group, except hydrogen atom and alkyl, may
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