disodium 5,5'-[sulphonylbis(3,1-phenyleneazo)]bis[6-amino-4-hydroxynaphthalene-2-sulphonate]

2-Naphthalenesulfonic acid, 5,5-sulfonylbis(3,1-phenyleneazo)bis6-amino-4-hydroxy-, disodium salt

5,5'-[Sulfonylbis(3,1-phenyleneazo)]bis(6-amino-4-hydroxy-2-naphthalenesulfonic acid)disodium salt