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The TIC of six quantified AAs and two of the monitored isomers in an urine sample containing approximately 100 ng/L of each target analyte (repre-sented as dashed line) is overlaid on the TIC of a calibration standard containing 100 pg/μL of each target analyte (represented as solid line). The three insets show the related structural isomers of OANS, OTOL and 26DM, each spiked at 100 pg/μL.
