Table 2. Representation of the binding affinity of the ligands of our interest with the active sites of the ACE2 receptor as compared to the control.

Ligand names	Binding affinity (Kcal/mol)	Amino acid involved interactions
		Hydrogen bond interactions	Hydrophobic bond interactions
Cassiarin D	−10.6	His345(2.95 Å), Glu406(2.70 Å), and Arg518(3.03 Å)	Asn149, Asp269, Phe274, Pro346, Asp367, Asp368, Glu375
Rhamnetin	−9.1	His345 (3.27 Å), Ala348(3.09 Å), His374(3.24 Å), and Glu402 (2.86 Å)	Pro346, Thr347, Thr371, Glu375, Tyr515
Lactupicrin	−10.2	Asp269 (2.80 Å) and Arg518(2.88 Å and 3.09 Å)	Arg273, Phe274, His345, Asp367, Glu406
Rhinacanthin D	−10.8	His345 (3.02 Å), Ala348 (3.14 Å), and Arg518 (2.80 Å and 3.12 Å)	with Pro346, Thr347, Asp367, Thr371, His374, Glu375, Tyr515
Flemiflavanone D	−10.2	Gly268 (3.17 Å), Asn277 (3.14), Cys344 (2.98 Å), and His345 (2.83 Å)	Glu145, Asn149, Asp269, Trp271, Phe274, Lys363, Asp367
Exiguaflavanone A	−9.3	Asn149 (2.90 Å), Gly268 (3.02 Å), and Asp368 (3.01 Å)	Thr371, Arg273, Trp271, Phe274, Thr276, Asp367, Asp269, Ala153, Cys344, Glu145, Lys363