title: Quantitative analysis of morphine in urine by gas chromatography-chemical ionization-mass spectrometry, with (N-C2H3)morphine as an internal standard.
mesh_terms: D000996:Antitussive Agents / Q000378:metabolism; D002849:Chromatography, Gas; D003061:Codeine / Q000378:metabolism; D003201:Computers; D003903:Deuterium; D005069:Evaluation Studies as Topic; D006801:Humans; D013058:Mass Spectrometry; D008722:Methods; D008832:Microchemistry; D009020:Morphine / Q000652:urine*; D013997:Time Factors
chemical_list: D000996:Antitussive Agents; D009020:Morphine; D003903:Deuterium; D003061:Codeine