title: An efficient synthesis of 19-nor-9beta,10alpha steroids.
mesh_terms: D000736:Androstenes / Q000138:chemical synthesis*; D007664:Ketosteroids / Q000138:chemical synthesis; D008722:Methods; D009654:Norsteroids / Q000138:chemical synthesis*
chemical_list: D000736:Androstenes; D007664:Ketosteroids; D009654:Norsteroids