1-Naphthalenesulfonic acid, 4,4'-((4,6-dihydroxy-1,3-phenylene)bis(azo))bis-, disodium salt 4,4'-((2,4-Dihydroxy-1,5-phenylene)bis(azo))bis(1-naphthalenesulfonic acid), disodium salt 73309-47-4 Disodium 4,4'-((4,6-dihydroxy-1,3-phenylene)bis(azo))bisnaphthalene-1-sulphonate EINECS 277-375-4