title: Improved determination of methamphetamine, ephedrine and methylephedrine in urine by extraction--thermospectrometry.
mesh_terms: D004809:Ephedrine / Q000031:analogs & derivatives* / Q000652:urine*; D006801:Humans; D007202:Indicators and Reagents; D008694:Methamphetamine / Q000652:urine*; D013053:Spectrophotometry
chemical_list: D007202:Indicators and Reagents; D008694:Methamphetamine; C041707:N-methylephedrine; D004809:Ephedrine