title: A comparison of some mass spectrometric ionization techniques using samples of morphine and illegal heroin.
mesh_terms: D002849:Chromatography, Gas; D005554:Forensic Medicine; D003932:Heroin / Q000032:analysis*; D013058:Mass Spectrometry / Q000379:methods*; D009020:Morphine / Q000032:analysis*; D009569:Nitric Oxide; D011803:Quinine / Q000032:analysis
chemical_list: D009569:Nitric Oxide; D003932:Heroin; D009020:Morphine; D011803:Quinine