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Docking pose 5 displays the essential amino acids, Cys145 (line style, not labeled for clarity), His41 (ball style), Met49 (line style), and His164 (stick style). S(Cys145) points to the quinoid ring centroid, 4.989 Å (value not shown for clarity), and the quinoid carbonyl, 4.612 Å. Met149 is rather detached from ring B centroid.
