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Quantitative ion chromatogram of an accidental overdose case from late 2016. Abbreviations are as follows: (1) norfentanyl-d5, (2) norfentanyl, (8) acetyl fentanyl 13C6, (10) U-47700, (13) fentanyl, (15) fentanyl-d5, (16) 4-ANPP, (18) furanyl fentanyl, (19) despropionyl para-fluorofentanyl, (21) butyryl/isobutyryl fentanyl, and (23) para-fluorobutyryl/para-fluoroisobutyryl fentanyl. Inset shows the low-response count region of IMF analogues.
