prov:value
| - ); R8 is a hydrogen atom, a methyl group, a phenyl group, ##STR7## (R is an alkyl group having 1-4 carbon atoms), an aryloxy group a benzyloxy group, an alkoxy group having 1-12 carbon atoms, or a carbamoyl group; R9 is a hydrogen atom, a hydroxyl group, an aryloxy group, a benzyloxy group, an alkoxy group having 1-12 carbon atoms, an acyloxy group or an acylamino group.
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