Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Total ion chromatogram from GC‐MS analysis of the seized sample powder, dissolved in methanol (0.2 mg/mL), showing (A) N‐phenyl‐1‐(2‐phenylethyl)piperidin‐4‐amine (precursor for synthesis of fentanyl analogues) at RT 15.576 min; and (B) the unknown compound at RT 17.949 min, identified as N‐phenyl‐N‐[1‐(2‐phenethyl)piperidin‐4‐yl]prop‐2‐enamide (synonym: acrylfentanyl). The peak at RT 13.412 min is also present in a blank solvent sample.
