title: [Steroid total synthesis. IV.(+)-13 -ethyl-17 -ethynyl-17 -hydroxy-gon-4-en-3-one].
mesh_terms: D000114:Acetylene; D006900:Hydroxylation; D008722:Methods; D009644:Norgestrel / Q000138:chemical synthesis*
chemical_list: D009644:Norgestrel; D000114:Acetylene