Synonyms: Ferrate(3-), tris(4-(4,5-dihydro-4-(2-(2-hydroxy-5-nitrophenyl)diazenyl)-3-methyl-5-oxo-1H-pyrazol-1-yl)benzenesulfonato(2-))di-, hydrogen (1:3);Ferrate(3-), tris(4-(4,5-dihydro-4-((2-hydroxy-5-nitrophenyl)azo)-3-methyl-5-oxo-1H-pyrazol-1-yl)benzenesulfonato(2-))di-, trihydrogen;Trihydrogen tris(4-(4,5-dihydro-4-((2-hydroxy-5-nitrophenyl)azo)-3-methyl-5-oxo-1H-pyrazol-1-yl)benzene-1-sulphonato(2-))diferrate(3-)