tetrasodium 5,5'-[(2,2'-disulphonato[1,1'-biphenyl]-4,4'-diyl)bis(azo)]disalicylate

3,3'-(2,2'-Disulfobiphenyl-4,4'-diylbisazo)bis(6-hydroxybenzoic acid)tetrasodium salt

Benzoic acid, 3,3-(2,2-disulfo1,1-biphenyl-4,4-diyl)bis(azo)bis6-hydroxy-, tetrasodium salt

4,4'-Bis[[4-hydroxy-3-(sodiooxycarbonyl)phenyl]azo]biphenyl-2,2'-disulfonic acid disodium salt