4-FIBF, 4-Fluorobutyrylfentanyl (also known as 4-FBF and p-FBF) is an opioid analgesic that is an analog of butyrfentanyl. para-FIBF,4-Fluoroisobutyryl fentanyl,p-Fluoroisobutyryl fentanyl,para-Fluoroisobutyryl fentanyl
It is closely related to 4-fluorofentanyl,
FIBF (hydrochloride) is an analytical reference material that is structurally categorized as an opioid. The physiological and toxicological properties of this compound are not known. This product is intended for research and forensic application.
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4-Fluorobutyrfentanyl and has been sold online as a designer drug. It is closely related to 4-fluorofentanyl, which has an EC50 value of 4.2 nM for the human receptor.
4-fluoroisobutyrylfentanyl is a highly selective ?-opioid receptor agonist whose analgesic potency is almost ten times of that reported for morphine. p-Fluoroisobutyryl fentanyl