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Left: The intricate hydrogen bond network found in the FAAH–3 crystal structure involving the catalytic triad and inhibitors containing a 2-pyridyl-6-carboxylate. 2Fo-Fc electron density maps at a contour level of 1.5σ for compound 3 and water molecules are shown with white meshes. Right: Orientation of Ser217 and the activating heterocycles of compounds 2,43 3, and 5 after superposition of the three structures highlighting the Ser217 π-OH H-bond.
