Modeling results in the SAM binding pocket of SARS-CoV nsp14 (PDB ID: 5C8T, resolution 3.2 Å). (A) Amino acids surrounding dinucleoside 13. Hydrogen and halogen bonds are indicated by red dashes. π-π stacking interaction is indicated by red curve. Distances are given in Å. (For interpretation of the references to color in this figure legend, the reader is referred to the Web version of this article.)