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. 2021 Apr 1;12:2016. doi: 10.1038/s41467-021-22362-2

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© The Author(s) 2021, corrected publication 2021

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Fig. 3 — Structure of compound 4 (a), GC376 (b), or MAC-5576 (c) bound to SARS-CoV-2 3CL^pro. Protomer A is denoted in green and protomer B is denoted in cyan. The Fo–Fc omit map, contoured at 3σ (gray), for compound 4 (d), GC376 (e), and MAC-5576 (f).