Synonyms: Ferrate(3-),tris[4-(hydroxy-kO)-3-(nitroso-kO)-1-naphthalenesulfonato(2-)]-,trisodium (9CI); Ferrate(3-),tris[4-hydroxy-3-nitroso-1-naphthalenesulfonato(2-)-O3,O4]-, trisodium;1-Naphthalenesulfonic acid, 4-hydroxy-3-nitroso-, iron complex; C.I. 10025;C.I. Acid Green 4; C.I. Acid Green 4, trisodium salt