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Chromatograms obtained upon GC-MS/MS analysis of urine samples from creosote workers for BaP-7,8,9,10-tetraols. The shaded peaks are tetra-trimethylsilyl derivatives of (A) BaP-tetraol 3; (B, D) internal standard racemic trans, anti-Phe-tetraol added upon collection of the BaP-tetraol enantiomers to monitor silylation efficiency; (C) BaP-tetraol 6.
