生物活性: SP inhibitor 1 (compound 34) is a selective SARS-CoV-2 spike protein (SP) inhibitor with an IC50 of 3.26 μM, >25 μM, >25 μM for SP, Mpro and PLpro protein, respectively. SP inhibitor 1 is a vitro SARS-CoV-2 replication inhibitor at non-toxic concentrations (0.32