Synonyms: Pregn-4-ene-3,20-dione,16a,17-epoxy- (8CI);Progesterone,16a,17-epoxy- (6CI);16a,17-Epoxypregn-4-ene-3,20-dione;16a,17-Epoxyprogesterone;16a,17a-Epoxy-4-pregnene-3,20-dione;16a,17a-Oxidopregn-4-ene-3,20-dione;16a,17a-Oxidoprogesterone;NSC 18315;16a,17a-Epoxy Progesterone;