[Synthesis of 11-keto-delta 9-norethisterone].
D055598:Chemical Phenomena; D002621:Chemistry; D003271:Contraceptive Agents, Female / Q000138:chemical synthesis*; D009640:Norethindrone / Q000031:analogs & derivatives* / Q000138:chemical synthesis
D003271:Contraceptive Agents, Female; C050790:11-keto-delta-9-norethisterone; D009640:Norethindrone