title: Use of an internal standard in a single-solvent thin-layer chromatographic analysis for drugs of abuse in urine.
mesh_terms: D002855:Chromatography, Thin Layer / Q000379:methods; D006801:Humans; D012015:Reference Standards; D012601:Scopolamine; D019966:Substance-Related Disorders / Q000652:urine*
chemical_list: D012601:Scopolamine