DAPs commonly used in biomonitoring studies and specific examples of DAPs found in urine following exposure to the OPs phosalone (A) and azinphos-methyl (B). Abbreviations: DEDTP, O,O-diethyldithiophosphate; DETP, O,O-diethylthiophosphate; DEP, O,O-diethylphosphate; DMDTP, O,O-dimethyldithiophosphate; DMTP, O,O-dimethylthiophosphate; DMP, O,O-dimethylphosphate.