Synonyms: Ammonium,methyl[4-[p-[methyl(m-sulfobenzyl)amino]-a-phenylbenzylidene]-2,5-cyclohexadien-1-ylidene](m-sulfobenzyl)-,hydroxide, inner salt, sodium salt (8CI); Benzenemethanaminium,N-methyl-N-[4-[[4-[methyl[(3-sulfophenyl)methyl]amino]phenyl]phenylmethylene]-2,5-cyclohexadien-1-ylidene]-3-sulfo-,inner salt, sodium salt (9CI); C.I. 42070