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Extracted ion chromatrogram (m/z 355.2185 ± 0.0005) overlay of the evaluation sample NOB-03 (green) and separate standards of para-fluorofentanyl (pink), meta-fluorofentanyl (red), and ortho-fluorofentanyl (blue) from the FAS Kit (all isomers). The evaluation sample was positively identified as the para-fluorofentanyl isomer due to the similar retention times.
