Synonyms: Pregn-4-ene-3,20-dione,16a,17-epoxy-11a-hydroxy- (7CI,8CI); Progesterone, 16a,17-epoxy-11a-hydroxy- (6CI);11a-Hydroxy-16a,17-epoxyprogesterone; 11a-Hydroxy-16a,17a-epoxypregn-4-ene-3,20-dione; 11a-Hydroxy-16a,17a-oxidoprogesterone; 16a,17-Epoxy-11a-hydroxypregn-4-ene-3,20-dione