hydrogen [4-[(2-chlorophenyl)[4-[ethyl(sulphonatobenzyl)amino]-o-tolyl]methylene]-3-methylcyclohexa-2,5-dien-1-ylidene](ethyl)(sulphonatobenzyl)ammonium, sodium salt
hydrogen [4-[(2-chlorophenyl)[4-[ethyl(sulphonatobenzyl)amino]phenyl]methylene]cyclohexa-2,5-dien-1-ylidene](ethyl)(sulphonatobenzyl)ammonium, sodium salt