3442-83-9 4-((4-Iminocyclohexa-2,5-dien-1-ylidene)benzyl)aniline monohydrochloride Benzenamine, 4-((4-imino-2,5-cyclohexadien-1-ylidene)phenylmethyl)-, monohydrochloride Doebner's Violet EINECS 222-353-1