title: Determination of opiates in biological samples through the analysis of heptafluorobutyric derivatives by gas chromatography/negative ion chemical ionization mass spectrometry.
mesh_terms: D000701:Analgesics, Opioid / Q000032:analysis* / Q000378:metabolism*; D003061:Codeine / Q000032:analysis / Q000378:metabolism; D005466:Fluorocarbons / Q000032:analysis* / Q000378:metabolism*; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods*; D006197:Hair / Q000737:chemistry; D006801:Humans; D015394:Molecular Structure; D009020:Morphine / Q000032:analysis / Q000378:metabolism; D009022:Morphine Derivatives / Q000032:analysis / Q000378:metabolism; D012680:Sensitivity and Specificity; D015813:Substance Abuse Detection / Q000379:methods*
chemical_list: D000701:Analgesics, Opioid; D005466:Fluorocarbons; D009022:Morphine Derivatives; C007924:heptafluorobutyric anhydride; D009020:Morphine; C026979:6-O-monoacetylmorphine; D003061:Codeine