2-Naphthalenesulfonic acid, 5-((4-ethoxyphenyl)azo)-8-((2-methoxyphenyl)azo)-, sodium salt 68227-62-3 EINECS 269-373-7 Sodium 5-((4-ethoxyphenyl)azo)-8-((2-methoxyphenyl)azo)naphthalene-2-sulphonate