Synonyms: Benzenemethanaminium, N,N-dimethyl-3-sulfo-N-(3-sulfophenyl)-, inner salt, calcium salt (2:1);Bis(dimethyl(3-sulfophenyl)(3-sulfobenzyl)ammonium) calcium salt;Benzenemethanaminium, N,N-dimethyl-3-sulfo-N-(3-sulfophenyl)-, hydroxide, inner salt, calcium salt;Benzenemethanaminium, N,N-dimethyl-3-sulfo-N-(3-sulfophenyl)-, inner salt, calcium salt;Dihydrogen bis(dimethyl(3-sulphonatobenzyl)(3-sulphonatophenyl)ammonium), calcium salt;calcium bis{3-[dimethyl(3-sulfonatobenzyl)ammonio]benzenesulfonate}