Benzoic acid,3,3'-((1,4-dioxo-2-butene-1,4-diyl)bis(imino-4,1-phenylene-2,1-diazenediyl))bis(6-hydroxy-,sodium salt (1:2), Benzoic acid,3,3'-((1,4-dioxo-2-butene-1,4-diyl)bis(imino-4,1-phenyleneazo))bis(6-hydroxy-,disodium salt, EINECS 276-377-2, Disodium 5,5'-((1,4-dioxobut-2-ene-1,4-diyl)bis(imino-p-phenyleneazo))disalicylate,