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Inhibitory effect of 4ca and 4ad on the entry of SARS-CoV-2 pseudovirus to host cells. The luciferase luminescence value was defined as 100% for the pseudovirus control. The values of luminescence of compound-treated groups were normalized accordingly. Data were expressed as mean ± standard error (n = 3). *p < 0.05, **p < 0.01, ***p < 0.001, ****p < 0.0001 compared with pseudovirus control group.
