Synonyms: Ferrate(1-), (3-(2-(2-(hydroxy-kappaO)-4-hydroxy-5-(2-(4-nitro-2-sulfophenyl)diazenyl)phenyl)diazenyl-kappaN1)-2-(hydroxy-kappaO)-5-nitrobenzenesulfonato(4-))-, sodium (1:1);Ferrate(1-), (3-((2,4-dihydroxy-5-((4-nitro-2-sulfophenyl)azo)phenyl)azo)-2-hydroxy-5-nitrobenzenesulfonato(4-))-, sodium;Ferrate(1-), (3-((2-(hydroxy-kappaO)-4-hydroxy-5-((4-nitro-2-sulfophenyl)azo)phenyl)azo-kappaN1)-2-(hydroxy-kappaO)-5-nitrobenzenesulfonato(4-))-, sodium;Sodium (3-((2,4-dihydroxy-5-((4-nitro-2-sulphophenyl)azo)phenyl)azo)-2-hydroxy-5-nitrobenzene-1-sulphonato(4-))ferrate(1-);iron(3+) sodium 5-nitro-3-[(2Z)-2-{3-[(E)-(4-nitro-2-sulfonatophenyl)diazenyl]-4-oxido-6-oxocyclohexa-2,4-dien-1-ylidene}hydrazinyl]-2-oxidobenzenesulfonate (1:1:1)