prov:value
| - (wherein each of R4 and R5 which are independent of each other, is a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group, an alkenyl group, an aryl group, an arylamino group or a heteroaryl group, R4 may, together with other substituent(s), form a condensed ring, and e is an integer of from 0 to 5.)
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