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SP inhibitor 1 is an inhibitor of SARS-CoV-2 replication at non-toxic concentrations (0.3250<5.98 μM) in vitro. SP inhibitor 1 is a selective inhibitor of SARS-CoV-2 stinger protein (SP), acting on SP protein (IC50: 3.26 μM), Mpro protein (IC50>25 μM) and PLpro protein (IC50>25 μM), and has cellular antiviral effects. and PLpro protein (IC50>25 μM), and has cellular antiviral effects.