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Gas chromatography-mass spectrometry (GC-MS) single ion monitoring chromatograms of 400 µL OF extract spiked with 1.00 ng/mL JWH-122 (A), JWH-210 (C) and UR-144 (E); OF samples consumers containing 4.00 ng/mL JWH-122 (B); 8.10 ng/mL JWH-210 (D); 7.40 ng/mL UR-144 (F). IS, internal standard.
