Acetyl-alpha-methylfentanyl
α-Methylacetylfentanyl is an analog of fentanyl with opioid analgesic properties. It was categorized under the Schedule I in the US and it was illegally sold in early 1980. α-Methylacetylfentanyl synthesis process is very similar to α-methylfentanyl with the substitution of the acetic anhydride for the production of chemical propionic anhydride in the synthesis.