prov:value
| - In the above formulae (4) and (5), each of R10, R11, and R12 is an alkyl group, an aryl group, or an aralkyl group, and each of R13 and R14 is a hydrogen atom, an alkyl group, an aryl group, or an aralkyl group, providing that a case where both of R13 and R14 are hydrogen atoms is excluded.
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