TMPRSS2 and COVID-19: The docking results show that the amino acid residues of small molecules and protein receptors have hydrogen bonds and interactions at VLA-280 (3.0 Å) and SER-436 (3.2 Å), and form cationic interactions at HIS-296 (5.0 Å), with a π bond (4.8 Å) formed at HIS-296 (Figure 10D), indicating that Diosmetin has a good binding ability of the TMPRSS2 protein (COVID-19).