1-((2-Methoxy-5-((4-nitrophenoxy)sulfonyl)phenyl)azo)-3-(((2-methylphenyl)amino)carbonyl)-2-naphthol 61968-79-4 72639-39-5 Benzenesulfonic acid, 3-((2-hydroxy-3-(((2-methylphenyl)amino)carbonyl)-1-naphthalenyl)azo)-4-methoxy-, 4-nitrophenyl ester EINECS 276-755-7 Nitrophenyl 3-((2-hydroxy-3-((2-methylphenyl)carbamoyl)-1-naphthyl)azo)-4-methoxybenzenesulphonate