title: Microchemical investigation of medicinal plants. XI. Identification of morphine and codeine in opium using GC/MS.
mesh_terms: D003061:Codeine / Q000032:analysis*; D008401:Gas Chromatography-Mass Spectrometry; D008832:Microchemistry; D009020:Morphine / Q000032:analysis*; D009892:Opium / Q000032:analysis*; D010207:Papaver / Q000032:analysis; D010946:Plants, Medicinal
chemical_list: D009020:Morphine; D009892:Opium; D003061:Codeine