disodium 5,5'-[(1,4-dioxobut-2-ene-1,4-diyl)bis(imino-p-phenyleneazo)]disalicylate

3,3'-[(1,4-Dioxo-2-butene-1,4-diyl)bis(imino-4,1-phenyleneazo)]bis(6-hydroxybenzoic acid)disodium salt

Benzoic acid, 3,3'-[(1,4-dioxo-2-butene-1,4-diyl)bis(imino-4,1-phenyleneazo)]bis[6-hydroxy-, disodium salt