Synonyms: Ammonium,[4-[bis[p-[ethyl(p-sulfobenzyl)amino]phenyl]methylene]-2,5-cyclohexadien-1-ylidene]dimethyl-,hydroxide, inner salt, monosodium salt (8CI); Methanaminium,N-[4-[bis[4-[ethyl[(4-sulfophenyl)methyl]amino]phenyl]methylene]-2,5-cyclohexadien-1-ylidene]-N-methyl-,inner salt, sodium salt (9CI); Formyl Violet SChB