title: Determination of propoxyphene hydrochloride, aspirin, phenacetin, and caffeine in combination.
mesh_terms: D001241:Aspirin / Q000032:analysis*; D002110:Caffeine / Q000032:analysis*; D002712:Chlorides / Q000032:analysis; D002845:Chromatography; D011431:Dextropropoxyphene / Q000032:analysis*; D004338:Drug Combinations; D008722:Methods; D010615:Phenacetin / Q000032:analysis*; D013053:Spectrophotometry
chemical_list: D002712:Chlorides; D004338:Drug Combinations; D002110:Caffeine; D010615:Phenacetin; D001241:Aspirin; D011431:Dextropropoxyphene