prov:value
| - R41 to R44 each preferably represents a hydrogen atom, an alkyl group, an aryl group, a heterocyclic group, a halogen atom, a cyano group, an alkoxyl group, an aryloxy group, an alkoxycarbonyl group, or an aryloxycarbonyl group, more preferably a hydrogen atom, an alkyl group, an aryl group, a heterocyclic group, a halogen atom, or a cyano group, and particularly preferably a hydrogen atom.
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