title: Gas-liquid chromatographic procedure for measurement of methylphenidate hydrochloride and its metabolite, ritalinic acid, in urine.
mesh_terms: D002648:Child; D002849:Chromatography, Gas; D005069:Evaluation Studies as Topic; D006801:Humans; D006948:Hyperkinesis / Q000652:urine; D008722:Methods; D008774:Methylphenidate / Q000378:metabolism / Q000652:urine* / Q000031:analogs & derivatives; D013997:Time Factors
chemical_list: D008774:Methylphenidate; C009189:ritalinic acid