4-Chloroisobutyrylfentanyl

4-Chloroisobutyrylfentanyl (para-Chloroisobutyrylfentanyl, 4-Cl-iBF) is an opioid analgesic that is an analog of fentanyl, and has been sold online as a designer drug.

4-Chloroisobutyrylfentanyl

4-Chloroisobutyrylfentanyl (para-Chloroisobutyrylfentanyl, 4-Cl-iBF) is an opioid analgesic that is an analog of fentanyl, and has been sold online as a designer drug.