prov:value
| - ing; each of R5 and R6 is a hydrogen atom, a halogen atom, an alkyl group, an aralkyl group, an alkoxy group, a substituted or unsubstituted aromatic ring, or a substituted or unsubstituted heterocyclic ring; R7 is an alkylene group having from 2 to 10 carbon atoms; and each of Ar2, Ar3, Ar4, Ar5, Ar6 and Ar7 is a substituted or unsubstituted aromatic ring, or a substituted or unsubstituted hetero
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