4-Hydroxy-3-[[2-methoxy-5-methyl-4-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]azo]-6-[(3-sulfophenyl)amino]-2-naphthalenesulfonic acid

4-hydroxy-3-[[2-methoxy-5-methyl-4-[[2-(sulphooxy)ethyl]sulphonyl]phenyl]azo]-6-[(3-sulphophenyl)amino]naphthalene-2-sulphonic acid