Sodium (4-((4-nitrophenyl)azo)anilino)methanesulphonate, Methanesulfonic acid,1-((4-(2-(4-nitrophenyl)diazenyl)phenyl)amino)-,sodium salt (1:1), Methanesulfonic acid,((4-((4-nitrophenyl)azo)phenyl)amino)-,sodium salt, EINECS 248-267-4, sodium [4-[(4-nitrophenyl)diazenyl]anilino]methanesulfonate, Methanesulfonic acid,((4-((4-nitrophenyl)azo)phenyl)amino)-,monosodium salt