Despropionyl para-fluorofentanyl is structurally similar to known opioids.
Despropionyl para-fluorofentanyl is a metabolite of FIBF (hydrochloride), a precursor in the synthesis of para-fluorofentanyl, and a potential impurity in para-fluorofentanyl preparations.
Despropionyl para-fluorofentanyl was identified in 4 samples submitted from Tennessee in the DEA Tox Report (2021 Q4).