2-((4-((3-Methyl-4-((phenylsulfonyl)oxy)phenyl)azo)phenyl)amino)-5-nitrobenzenesulfonic acid, potassium salt 75627-29-1 Benzenesulfonic acid, 2-((4-((3-methyl-4-((phenylsulfonyl)oxy)phenyl)azo)phenyl)amino)-5-nitro-, monopotassium salt EINECS 278-280-0 Potassium 2-((4-((3-methyl-4-((phenylsulphonyl)oxy)phenyl)azo)phenyl)amino)-5-nitrobenzenesulphonate