[{"from": "human", "value": "Provide a description of this molecule. [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 commonly used to treat chronic cancer pain or in anesthesia. Fentanyl is related to other opioids like [morphine] and [oxycodone].  Fentanyl's high potency has also made it a common adulterant in illicit drugs, especially heroin. In 2017, 47600 overdose deaths in the United States involved some opioid (over 2/3 of all overdose deaths). Opioid overdoses kill an average of 11 Canadians daily.  Fentanyl was FDA approved in 1968."}]