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GC-NICI-MS/MS chromatograms obtained upon analysis of a human urine sample for tetra-TMS derivatives of: (A) PheT (7), m/z 372.130 → m/z 210.07; (B) internal standard [13C6]PheT, m/z 378.016 → m/z 216.070; and (C) injection and derivatization standard [D10]PheT-TMS, m/z 382.160 → m/z 220.070.
