| http://www.w3.org/ns/prov#value | - ; R7, R8, R9, R10 and R11 each independently are a hydrogen atom, a chlorine atom, a hydroxyl group, an alkyl group having a carbon number of 1-18, an alkoxy group having a carbon number of 1-18, an alkylthio group having a carbon number of 1-18, an alkenyloxy group having a carbon number of 3-4, an alkynyloxy group having a carbon number of 3-4, a phenyl group, a benzoyl group, a benzoyloxy group
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