prov:value
| - The alkylene group, aryl group and condensed polycyclic group represented by R1, R2, R3, Ar1, Ar2 and Ar3 may have substituents, and specific examples of the substituents include, but are not limited to, alkyl groups such as a methyl group, an ethyl group and a propyl group; alkoxy groups such as a methoxy group, an ethoxy group and a propoxy group; aryl groups such as a phenyl group and a naphthy
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