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Protection of salvinorin B as standard alkoxyalkyl ethers yielded highly potent κ opioid receptor agonists. Ethoxymethyl ether 6 is among the most potent and selective κ agonists reported to date. Fluoroethoxymethyl ether 11 is the first potent, selective fluorinated κ ligand, with potential use in MRI and PET studies. Further enlargement of the alkoxy group, alkylation of the acetal carbon, or heteroatom...
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