prov:value
| - halogen atom, a cyano group, a heterocyclic group, or a silyl group, still preferably a hydrogen atom, an alkyl group, an alkenyl group, an alkynyl group, an aryl group, an alkoxy group, an aryloxy group, a halogen atom, a cyano group, or an aromatic heterocyclic group, particularly preferably a hydrogen atom, an alkyl group, an aryl group, or an aromatic heterocyclic group.
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