title: Ring-D-bridged steroid analogs. X. Synthesis and nuclear magnetic resonance spectral properties of 3 -acetoxy-14 ,17 -ethano-5,15-pregnadien-20-one, 3 -acetoxy-14 ,17 -ethano-5-pregnen-20-one, and 3 -acetoxy-16,16'-cyclo-14 ,17 -ethano-5-pregnen-20-one.
mesh_terms: D001952:Bridged-Ring Compounds / Q000138:chemical synthesis*; D003525:Cyclosteroids / Q000138:chemical synthesis*; D009682:Magnetic Resonance Spectroscopy; D011283:Pregnenes / Q000138:chemical synthesis*; D013053:Spectrophotometry
chemical_list: D001952:Bridged-Ring Compounds; D003525:Cyclosteroids; D011283:Pregnenes