title: 14 Alpha, 17 alpha-alkylidenedioxy steroids. 2. 19-Nor-9 alpha, 10 beta- and 19-nor-9 beta, 10 alpha-progesterone analogs.
mesh_terms: D000818:Animals; D003270:Contraceptive Agents / Q000138:chemical synthesis* / Q000494:pharmacology; D004149:Dioxoles / Q000138:chemical synthesis / Q000494:pharmacology; D005260:Female; D008968:Molecular Conformation; D009654:Norsteroids / Q000138:chemical synthesis / Q000494:pharmacology; D011374:Progesterone / Q000138:chemical synthesis* / Q000494:pharmacology; D011817:Rabbits; D051381:Rats; D012098:Reproduction / Q000187:drug effects; D013237:Stereoisomerism; D013329:Structure-Activity Relationship
chemical_list: D003270:Contraceptive Agents; D004149:Dioxoles; D009654:Norsteroids; D011374:Progesterone