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Binding modes of 2-azaspiro [3.3] inhibitors 2c (A and D), 3c (B and E) and 4c (C and F) with SARS-CoV-2 3CLpro. Fo-Fc omit map (green mesh) contoured at 3σ (A-C). Hydrogen bond interactions (dashed lined) (D-F). PDB IDs: 2c (7T42), 3c (7T43), 4c (7T44).
