title: Letter: Use of infrared spectroscopy in drug analysis.
mesh_terms: D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods; D006801:Humans; D008968:Molecular Conformation; D004364:Pharmaceutical Preparations / Q000032:analysis*; D013055:Spectrophotometry, Infrared / Q000379:methods
chemical_list: D004364:Pharmaceutical Preparations