Crotonylfentanyl
Crotonylfentanyl
Opioid analgesic designer drug
Crotonylfentanyl is an opioid analgesic that is an analog of fentanyl and structural isomer of cyclopropylfentanyl[1] and has been sold online as a designer drug.[2][3] In December 2019, the UNODC announced scheduling recommendations placing crotonylfentanyl into Schedule I.[4]