prov:value
| - In cases where R1 is substituted, substituent thereof include, for example, a halogen atom, aryl group, alkoxy group, amino group, acyl group, acylamino group, alkylthio group, arylthio group, sulfonamido group, acyloxy group, oxycarbonyl group, carbamoyl group, sulfamoyl group, sulfonyl group, and phosphoryl group. [0020] R2 is a hydrogen atom, a substituted or unsubstituted alkyl group, or a sub
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