Synonyms: Hydrogen (4-(4-(4-ethoxyanilino)-4'-(ethyl(3(or 4)-sulphonatobenzyl)amino)benzhydrylidene)cyclohexa-2,5-dien-1-ylidene)(ethyl)(3(or 4)-sulphonatobenzyl)ammonium, sodium salt;Benzenemethanaminium, N-(4-((4-((4-ethoxyphenyl)amino)phenyl)(4-(ethyl((3(or 4)-sulfophenyl)methyl)amino)phenyl)methylene)-2,5-cyclohexadien-1-ylidene)-N-ethyl-3(or 4)-sulfo-, hydroxide, inner salt, monosodium salt