2-Naphthalenesulfonic acid, 5(8)-(4-hydroxyphenylazo)-8(5)-(2-methylphenylazo)-, sodium salt 2-Naphthalenesulfonic acid, 5(or 8)-((4-hydroxyphenyl)azo)-8(or 5)-((2-methylphenyl)azo)-, monosodium salt 67892-54-0 EINECS 267-588-0 Sodium (5or 8)-((4-hydroxyphenyl)azo)-(8or5)-((2-methylphenyl)azo)naphthalene-2-sulphonate