2-Naphthalenesulfonic acid, 5-((4-((4-((2,8-dihydroxy-6-sulfo-1-naphthalenyl)azo)-2-methylphenyl)methyl)phenyl)azo)-4,6-dihydroxy-, disodium salt 73513-98-1 Disodium 5-((4-((4-((2,8-dihydroxy-6-sulphonatonaphthyl)azo)-o-tolyl)methyl)phenyl)azo)-4,6-dihydroxynaphthalene-2-sulphonate EINECS 277-521-7