title: Ring C conformation of 6beta-naltrexol and 6alpha-naltrexol. Evidence from proton and carbon-13 nuclear magnetic resonance.
mesh_terms: D009682:Magnetic Resonance Spectroscopy; D008968:Molecular Conformation; D009270:Naloxone / Q000031:analogs & derivatives*; D009271:Naltrexone / Q000031:analogs & derivatives*
chemical_list: D009270:Naloxone; C010410:6 beta-hydroxynaltrexone; D009271:Naltrexone