17-Hydroxypregna-4,6-diene-3,20-dione acetate 17-Hydroxypregna-4,6-diene-3,20-dione acetate (ester) 425-51-4 Melengestro acetate NSC 77897 Pregna-4,6-diene-3,20-dione, 17-hydroxy-, acetate (ester) delta(sup 6)-Dehydro-17-acetoxyprogesterone