Synonyms: 21-Fluoroprogesterone;21-Fluoropregn-4-ene-3,20-dione;Progesterone, 21-fluoro-;NSC 19608;Pregn-4-ene-3,20-dione, 21-fluoro-;434-18-4;C14488;AC1L43PV;Pregn-4-ene-3, 21-fluoro-;Progesterone, 21-fluoro- (6CI);NSC19608;NSC-19608;LS-118676;(8S,9S,10R,13S,14S,17S)-17-(2-fluoroacetyl)-10,13-dimethyl-1,2,6,7,8,9,11,12,14,15,16,17-dodecahydrocyclopenta[a]phenanthren-3-one