Also Called: Benzenesulfonic acid, 3-[[2-hydroxy-3-[[(2-methylphenyl) amino]carbonyl]-1-naphthalenyl]azo]-4-methoxy -, 4-nitrophenyl ester;Benzenesulfonic acid, 3-[[2-hydroxy-3-[[(2-methylphenyl)amino]carbonyl]-1-naphthalenyl]azo]-4-methoxy-, 4-nitrophenyl ester;Benzenesulfonic acid, 3-[2-[2-hydroxy-3-[[(2-methylphenyl)amino]carbonyl]-1-naphthalenyl]diazenyl]-4-methoxy-, 4-nitrophenyl ester