6428-35-9 3,3-[Ureylenebis[(1-hydroxy-3-sodiosulfonaphthalene-6,2-diyl)azo(4,1-phenylene)azo]]bis[4,5-dihydroxynaphthalene-2,7-disulfonic acid disodium] salt
6428-36-0 3,3-[(3-Sodiosulfo[1,1-biphenyl]-4,4-diyl)bis(azo)]bis[6-[(2,4-diaminophenyl)azo]-4-hydroxynaphthalene-2-sulfonic acid sodium] salt