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. 2016 Aug 24;9(3):415–422. doi: 10.1002/dta.2046

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© 2016 The Authors. Drug Testing and Analysis Published by John Wiley & Sons Ltd.

This is an open access article under the terms of the Creative Commons Attribution‐NonCommercial‐NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made.

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Mass spectrum for precursor (+MS) (top) and product ions (+bbCID) (bottom) for fentanyl, (C₂₂H₂₉N₂O). The product ion at m/z 188.1448 corresponds to C₁₃H₁₈N, which is a well‐known fragmentation pathway for fentanyl (cf.35).