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Chemical structures
of β-lactone NAAA inhibitors, (S)-N-(2-oxo-3-oxetanyl)-3-phenylpropanamide [(S)-OOPP], N-[(2S,3R)-2-methyl-4-oxo-oxetan-3-yl]
carbamate (ARN077), and N-[(2S,3R)-2-methyl-4-oxo-oxetan-3-yl]-7-phenyl-heptanamide (ARN768).