disodium 2-methyl-4-[[4-[[4-[(3-tolyl)amino]phenyl][4-[(3-methyl-4-sulphonatophenyl)amino]phenyl]methylene]-2,5-cyclohexadien-1-ylidene]amino]benzenesulphonate

2-Methyl-4-[[4-[[4-[(3-methylphenyl)amino]phenyl][4-[[3-methyl-4-(sodiosulfo)phenyl]amino]phenyl]methylene]-2,5-cyclohexadien-1-ylidene]amino]benzenesulfonic acid sodium salt