title: An orally active long-acting estrogen (AY-20,121).
mesh_terms: D000818:Animals; D002369:Castration; D003276:Contraceptives, Oral / Q000008:administration & dosage* / Q000494:pharmacology; D004962:Estranes / Q000494:pharmacology; D004967:Estrogens / Q000008:administration & dosage* / Q000494:pharmacology; D004997:Ethinyl Estradiol / Q000494:pharmacology; D005260:Female; D005306:Fertilization / Q000187:drug effects*; D010053:Ovary / Q000502:physiology; D051381:Rats; D014621:Vagina / Q000187:drug effects
chemical_list: D003276:Contraceptives, Oral; D004962:Estranes; D004967:Estrogens; D004997:Ethinyl Estradiol