Determination of acetylsalicylic acid, salicylamide,  acetaminophen, and caffeine in tablets or powders by independent methods.
D000082:Acetaminophen / Q000032:analysis*; D001241:Aspirin / Q000032:analysis*; D001322:Autoanalysis; D002110:Caffeine / Q000032:analysis*; D008722:Methods; D012457:Salicylamides / Q000032:analysis*; D013053:Spectrophotometry; D013607:Tablets / Q000032:analysis
D012457:Salicylamides; D013607:Tablets; D000082:Acetaminophen; D002110:Caffeine; D001241:Aspirin