title: Pentacyclic steroids. Synthesis of 4,6beta-ethanoestradiol, 4,6beta-ethanoestrone, and 17alpha-ethynyl-4,6beta-ethanoestradiol.
mesh_terms: D004958:Estradiol / Q000031:analogs & derivatives* / Q000138:chemical synthesis; D004970:Estrone / Q000031:analogs & derivatives* / Q000138:chemical synthesis; D004997:Ethinyl Estradiol / Q000031:analogs & derivatives* / Q000138:chemical synthesis; D008722:Methods
chemical_list: D004970:Estrone; D004997:Ethinyl Estradiol; D004958:Estradiol