(4-(4,4'-Bis(dimethylamino)benzhydrylidene)cyclohexa-2,5-dien-1-ylidene)dimethylammonium chloride (4-(Bis(p-(dimethylamino)phenyl)methylene)-2,5-cyclohexadien-1-ylidene)dimethylammonium chloride 12416 Violet 23355-47-7 548-62-9