disodium 5-[ethyltolylamino]-2-[[4-[(3-sulphonatophenyl)azo]-1-naphthyl]azo]benzenesulphonate

5-[Ethyl(phenylmethyl)amino]-2-[[4-[(3-sulfophenyl)azo]-1-naphtyl]azo]benzenesulfonic acid disodium salt