Β-funaltrexamine
beta-Funaltrexamine
Chemical compound
β-Funaltrexamine (β-FNA) is an irreversible (covalently bonding) opioid antagonist that was used to create the first crystal structure of the μ-opioid receptor.[1] Chemically, it is a naltrexone derivative with a methyl-fumaramide group in the 6-position.