Figure 2: The three most AP's 6LU7 Mpro. (a) 5,4-Dihydroxy-7-O-β-D-pyran-glycuronate butyl ester. (b) 3-O-β-D-glucopyranosyl-andrographolide. (c) 7,8-Dimethoxy-2'-hydroxy-5-O-β-D-glucopyranosyloxyflavone