prov:value
| - In the above-mentioned general formula (4) or (5), each of R11, R13 and X is a hydrogen atom, a halogen atom, an alkyl group, an aralkyl group, an aryl group, a substituted silyl group, an alkoxy group, an aralkyloxy group, an aryloxy group or a heterocyclic group, and two R11's, R13's, X1's and X2's may be respectively the same or different mutually.
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