[{"from": "human", "value": "Could you give me a brief overview of this molecule? [C][C][C][C][=Branch1][C][=O][N][Branch2][Ring1][Branch1][C][C][C][N][Branch1][Branch1][C][C][Ring1][=Branch1][C][C][C][=C][C][=C][C][=C][Ring1][=Branch1][C][=C][C][=C][C][=C][Ring1][=Branch1]"}, {"from": "gpt", "value": "The molecule is a potent short-acting synthetic opioid analgesic drug. It is an analog of [fentanyl] with roughly 1/30 the potency. Butyrfentanyl was first synthesized in 1961 by Janssen Pharmaceuticals as a new opioid analgesic.  Butyrfentanyl has no current legitimate clinical applications, but anecdotal reports indicate it may occasionally be surfacing on the grey-market as a recreational drug. This compound is a schedule I controlled substance in the USA because it is a positional isomer of 3-Methylfentanyl.  The DEA in the United States has confirmed at least 40 fatalities involving butyrfentanyl before May 2016."}]