title: Determination of phenoxymethyl penicilloic acid and phenoxyethyl penicilloic acid in urine in the presence of the parent penicillins.
mesh_terms: D000577:Amides / Q000652:urine*; D002855:Chromatography, Thin Layer; D003124:Colorimetry; D008722:Methods; D010404:Penicillin V / Q000031:analogs & derivatives* / Q000652:urine*; D013844:Thiazoles / Q000652:urine*
chemical_list: D000577:Amides; D013844:Thiazoles; D010404:Penicillin V