tetrasodium p,p'-[vinylenebis[(3-sulphonato-p-phenylene)-ONN-azoxy-p-phenyleneazo]]dibenzoate

Benzoic acid, 4,4'-[1,2-ethenediylbis[(3-sulfo-4,1-phenylene)-ONN-azoxy-4,1-phenyleneazo]]bis-, tetrasodium salt

4,4'-[1,2-Ethenediylbis[(3-sodiooxysulfonyl-4,1-phenylene)-ONN-azoxy-4,1-phenyleneazo]]bisbenzoic acid disodium salt