sodium 3-[[2-hydroxy-3-[(4-methoxy-o-tolyl)carbamoyl]-1-naphthyl]azo]-4-methoxybenzenesulphonate

3-[[2-Hydroxy-3-[[(4-methoxy-2-methylphenyl)amino]carbonyl]-1-naphthalenyl]azo]-4-methoxybenzenesulfonic acid sodium salt