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Antiviral activity of SARS-CoV-2 PLpro inhibitors GRL0617 (A), EACC(B), KY-226 (C), and tropifexor (D) against SARS-CoV-2 in Calu-3 cells. The results were quantified by immunofluorescence assay. Values represent the average ± standard deviation of three replicates.
