1-Naphthalenesulfonic acid, 4,4'-((2,4-dihydroxy-5-((4-sulfophenyl)azo)-1,3-phenylene)bis(azo))bis-, trisodium salt 2,6-Di(1-azo-4-sulfonaphthalene)-4-(1-azo-4-sulfobenzene)resorcinoltrisodium salt 68877-39-4