disodium 4,4'-[(4,6-dihydroxy-1,3-phenylene)bis(azo)]bisnaphthalene-1-sulphonate

4,4'-(4,6-Dihydroxy-1,3-phenylenebisazo)bis(naphthalene-1-sulfonic acid sodium) salt

1-Naphthalenesulfonic acid, 4,4'-[(4,6-dihydroxy-1,3-phenylene)bis(azo)]bis-, disodium salt