17-Hydroxypregna-4,6-diene-3,20-dione Acetate17α-Acetoxypregna-4,6-diene-3,20-dione17α-Hydroxy-6-dehydroprogesterone AcetateMelengestro AcetateΔ6-Dehydro-17α-acetoxyprogesteroneNSC 77897Pregna-4,6-dien-17-ol-3,20-dione Acetate17-(Acetyloxy)pregna-4,6-diene-3,20-dione6,7-Dehydro-17α-acetoxy Progesterone