Synonyms: Ferrate(4-),hexacyano-, tetrahydrogen (8CI); Ferrate(4-), hexakis(cyano-C)-, tetrahydrogen,(OC-6-11)-; Ferrate(4-), hexakis(cyano-kC)-, tetrahydrogen, (OC-6-11)- (9CI); Ferrocyanic acid(6CI); Hydrogen hexacyanoferrate(II) (7CI); Ferrocyanhydric acid;Hydroferrocyanic acid; NSC 187672; Tetrahydrogen hexacyanoferrate;Tetrahydrogen hexacyanoferrate(4-)