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Electron impact (EI) mass spectra acquired during GC‐MS analysis of (A) a standard of N‐phenyl‐N‐[1‐(2‐phenethyl)piperidin‐4‐yl]propanamide (fentanyl) at RT 17.949 min; and (B) the unknown compound, identified as N‐phenyl‐N‐[1‐(2‐phenethyl)piperidin‐4‐yl]prop‐2‐enamide (acrylfentanyl) at RT 17.696 min. Background ions were subtracted for both spectra. Bond cleavage sites for key fragment ions are assigned according to Ohta et al.32
