[{"from": "human", "value": "Please give me some details about this molecule. [C][C][Branch1][#Branch2][C][C][=C][C][=C][C][=C][Ring1][=Branch1][N][C][C][C][Branch1][Branch1][C][C][Ring1][=Branch1][N][Branch1][=Branch2][C][=C][C][=C][C][=C][Ring1][=Branch1][C][=Branch1][C][=O][C]"}, {"from": "gpt", "value": "The molecule 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. \u03b1-Methylacetylfentanyl synthesis process is very similar to \u03b1-methylfentanyl with the substitution of the acetic anhydride for the production of chemical propionic anhydride in the synthesis."}]