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There is a page named "Butyrylnorfentanyl" on Wikipedia
Butyrnorfentanyl or butyrylnorfentanyl is an inactive synthetic opioid analgesic drug precursor. It is an analog of fentanyl. 3-Methylbutyrfentanyl 4-Fluorobutyrfentanyl...6 KB (570 words) - 07:22, 6 January 2024
