Figure 11.3.  Energy, hydrogen bond analysis and decomposition analysis of SARS–CoV spike glycoprotein (PDB ID: 5WRG) with withanolide B (A) MM/PB(GB)SA result consists of electrostatic energy (ELE), van der Waals contribution (VDW), total gas phase energy (GAS), non–polar and polar contributions to solvation (PBSOL/GBSOL) (B,C) Statistics of hydrogen bonds (D) energy decompose of protein–ligand complex (Kcal/mol) (E) Graphical representation of decompose result (F) Showing the heatmap of decompose.