2-Naphthalenesulfonic acid, 3-((4-((4-amino-7-sulfo-1-naphthalenyl)azo)phenyl)azo)-6-((2,4-diaminophenyl)azo)-4-hydroxy-, disodium salt 6409-25-2 Disodium 3-((4-((4-amino-7-sulphonatonaphthyl)azo)phenyl)azo)-6-((2,4-diaminophenyl)azo)-4-hydroxynaphthalene-2-sulphonate EINECS 229-081-2