2-Naphthalenesulfonic acid, 6-hydroxy-5-((2-methyl-4-((2-methylphenyl)azo)phenyl)azo)-, monosodium salt 2-Naphthalenesulfonic acid, 6-hydroxy-5-((4-(o-tolylazo)-o-tolyl)azo)-, sodium salt (8CI) 7357-71-3 EINECS 230-889-2 NSC 65557 Sodium 6-hydroxy-5-((4-(o-tolylazo)-o-tolyl)azo)naphthalene-2-sulphonate