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Comparison of 5d (coral), 6d (gray) and 8d (magenta) in the MERS-CoV 3CLpro active site. A) Surface representation showing the orientation of the superimposed inhibitors. Neighboring residues are colored yellow (nonpolar), cyan (polar), and white (weakly polar). B) Zoomed-in view showing the aryl rings in the S4 pocket. PDB IDs: 5d (8E6C), 6d (8E6D), 8d (8E6E).
