1,4-Benzenediamine,N-(4-aminophenyl)-N'-[4-(phenylimino)-2,5-cyclohexadien-1-ylidene]- (9CI);p-Phenylenediamine,N-(p-aminophenyl)-N'-(4-phenylimino-2,5-cyclohexadien-1-ylidene)- (6CI);Willstatter's blue imide
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