2-Naphthalenesulfonic acid, 5(or 8)-((4-(((4-methylphenyl)sulfonyl)oxy)phenyl)azo)-8(or 5)-((4-((4-nitro-2-sulfophenyl)amino)phenyl)azo)-, disodium salt 72275-95-7 Disodium (5or8)-((4-(((4-methylphenyl)sulphonyl)oxy)phenyl)azo)-(8or5)-((4-((4-nitro-2-sulphonatophenyl)amino)phenyl)azo)naphthalene-2-sulphonate EINECS 276-560-7