Bis[3-[[ethyl[4-[[4-[ethyl(3-sulfonatobenzyl)iminio]-2,5-cyclohexadienylidene]phenylmethyl]phenyl]amino]methyl]benzenesulfonic acid]barium salt

dihydrogen (ethyl)[4-[alpha-[4-[ethyl(3-sulphonatobenzyl)amino]phenyl]benzylidene]cyclohexa-2,5-dien-1-ylidene](3-sulphonatobenzyl)ammonium, barium salt