2-Naphthalenesulfonic acid, 5(or 8)-((4-ethoxy-2-methylphenyl)azo)-8(or 5)-(phenylazo)-, sodium salt 68039-08-7 EINECS 268-230-6 Sodium (5or8)-((4-ethoxy-2-methylphenyl)azo)-(8or5)-(phenylazo)naphthalene-2-sulphonate