| http://www.w3.org/ns/prov#value | - wherein Ar6 and Ar7 are independently an arylene group having 6 to 30 carbon atoms, E1 and E2 are independently an aryl or alkyl group having 6 to 30 carbon atoms, a hydrogen atom or a cyano group, q is an integer of 1 to 3, and U and/or V is a substituent containing an amino group, and the amino group is preferably an arylamino group.
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