prov:value
| - , an alkyl group having a carbon number of 1-4, or an alkoxy group having a carbon number of 1-8, is specifically preferable.A specifically preferable compound represented by general formula (I) is a compound, in which R2, R3, R4 and R5 each independently are a hydrogen atom, a chlorine atom, a hydroxyl group, an alkyl group having a carbon number of 1-18, a benzyl group, a phenyl group, a cycloal
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