Iron protoporphyrin ix; Ferroheme (VAN); Ferroprotoporphyrin IX; Ferrous protoheme; Ferrous protoheme IX; Heme (VAN); Iron protoporphyrin; Iron(II) protoporphyrin IX; NSC 16669; NSC 267100; Protohaem; Protoheme IX (VAN); Reduced hematin; Ferrate(2-), (7,12-diethenyl-3,8,13,17-tetramethyl-21H,23H-porphine-2,18-dipropanoato(4-)-N21,N22,N23,N24)-, dihydrogen, (SP-4-2)-; Ferrate(2-), (7,12-diethenyl-3,8,13,17-tetramethyl-21H,23H-porphine-2,18-dipropanoato(4-)-kappaN21,kappaN22,kappaN23,kappaN24)-, dihydrogen, (SP-4-2)-; Ferrate(2-), (7,12-diethenyl-3,8,13,17-tetramethyl-21H,23H-porphine-2,18-dipropanoato(4-)-kappaN21,kappaN22,kappaN23,kappaN24)-, hydrogen (1:2), (SP-4-2)-; Iron, (dihydrogen 3,7,12,17-tetramethyl-8,13-divinyl-2,18-porphinedipropionato(2-))- (8CI); iron(2+) 2,18-bis(2-carboxyethyl)-7,12-diethenyl-3,8,13,17-tetramethylporphine-21,23-diide