5-Quinolinesulfonic acid, 8-hydroxy-7-((4-sulfo-1-naphthalenyl)azo)-, disodium salt 53611-17-9 7-(4-Sulfo-1-naphthylazo)-8-hydroxyquinoline-5-sulfonic acid, disodium salt Disodium 8-hydroxy-7-((4-sulphonato-1-naphthyl)azo)quinoline-5-sulphonate EINECS 258-663-9