4-((4-((4-Hydroxy-2-methylphenyl)azo)phenyl)amino)-3-nitrobenzenesulfonic acid, sodium salt 61931-26-8 70865-20-2 Benzenesulfonic acid, 4-((4-((4-hydroxy-2-methylphenyl)azo)phenyl)amino)-3-nitro-, monosodium salt EINECS 274-950-1 Sodium 4-((4-((4-hydroxy-2-methylphenyl)azo)phenyl)amino)-3-nitrobenzenesulphonate