Table 1. Binding Energy of SARS-CoV-2 S Protein RBDs Binding With ACE2 Binding Domain. SD Stands for Standard Deviation.

Energy terms	Magnitude (kcal/mol)
	Mean	SD
Polar solvation energy	630.18	11.7
Nonpolar solvation energy	–18.41	0.41
Van der Waals energy	–128.53	8.43
Coulombic energy	–656.69	16.04
Electrostatic energy	–26.51	10.48