4-MeO-Butyrfentanyl

4-MeO-Butyrfentanyl is a rare synthetic opioid belonging to the fentanyl analogue class of compounds. The substance has received minimal documentation in both scientific literature and online harm reduction communities, and its precise history of synthesis and development remains poorly documented. It should be distinguished from the related compound butyrfentanyl, which has been more extensively characterized.

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