Synonyms: Pregn-4-en-3-one,17,20a-dihydroxy- (7CI,8CI); 17,20a-Dihydroxy-4-pregnen-3-one; 17a,20a-Dihydroxy-4-pregnen-3-one; 17a,20a-Dihydroxypregn-4-ene-3-one; 17a,20a-Dihydroxyprogesterone; 17a-Hydroxy-20a-dihydroprogesterone; 20a-Dihydroxyprogesterone; Pregn-4-ene-17a,20a-diol-3-one