title: The addition of dihalocarbenes to 3 -acetoxy-B-norandrost-5-en-17-one.
mesh_terms: D000736:Androstenes / Q000138:chemical synthesis*; D055598:Chemical Phenomena; D002621:Chemistry; D003525:Cyclosteroids / Q000138:chemical synthesis; D009654:Norsteroids; D013237:Stereoisomerism
chemical_list: D000736:Androstenes; D003525:Cyclosteroids; D009654:Norsteroids