2-Naphthalenesulfonic acid, 5-((4-hydroxyphenyl)azo)-8-((2-methoxyphenyl)azo)-, monosodium salt 5-((4-Hydroxyphenyl)azo)-8-((2-methoxyphenyl)azo)-2-naphthalenesulfonic acid, sodium salt 67906-52-9 EINECS 267-720-7 Sodium 5-((4-hydroxyphenyl)azo)-8-((2-methoxyphenyl)azo)naphthalene-2-sulphonate