2.3. Pseudotyped SARS-CoV-2 based entry inhibition assay

A lentiviral-based pseudovirus carrying the SARS-CoV-2 S protein (SARS-CoV-2pp) was prepared as previously described (Xia et al., 2020), while 293T cells transiently expressing human ACE2 and TMPRSS2 were adopted as target cells (Fig. S1A). The pseudovirus entry assay was conducted by inoculation of SARS-CoV-2pp to target cells in presence of increasing concentrations of test compound, with final concentrations ranged from 100 μM to 1.56 μM. After incubation for 48 h, luciferase activity was analyzed to monitor viral entry efficacy.

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