Fig. 3.

2-D and 3-D images of docking interactions between catechins and the spike protein of wild strain. Hydrogen bonding is depicted by green dotted lines, van der Waals interaction is depicted by green circles, pi-anion or pi-cation interactions are depicted by orange dotted lines, pi-alkyl bond is shown by pink dotted lines, pi-sigma or pi-pi bond is depicted by purple dotted lines, pi-sulphur bond is depicted by yellow dotted lines, interaction with halogen is depicted by cyan dotted line and certain unfavourable interactions are depicted by red dotted line.