title: Morphine analysis by high-performance liquid chromatography.
mesh_terms: D002849:Chromatography, Gas / Q000379:methods; D002851:Chromatography, High Pressure Liquid / Q000379:methods; D006801:Humans; D009020:Morphine / Q000097:blood*; D009022:Morphine Derivatives / Q000097:blood
chemical_list: D009022:Morphine Derivatives; D009020:Morphine; C010616:normorphine