title: Preparation of some 7,7-dimethyl-19-nor steroids by total synthesis. Structure determination by x-ray diffraction.
mesh_terms: D004958:Estradiol / Q000138:chemical synthesis; D008745:Methylation; D009654:Norsteroids / Q000138:chemical synthesis*; D013329:Structure-Activity Relationship; D013739:Testosterone / Q000138:chemical synthesis; D014961:X-Ray Diffraction
chemical_list: D009654:Norsteroids; D013739:Testosterone; D004958:Estradiol