4-Fluoroisobutyrfentanyl.jpg

4-Fluoroisobutyrfentanyl (4-FIBF) is a is an opiod RC and an analog of fentanyl that is reported to be roughly one third of the potency of fentanyl itself.

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Notice: This product is only suitable for laboratory use, or the use of animals. It can not be used directly on the human body

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