In this study, we analyzed CHEMBL3120791 and performed Molecular dynamic simulations of protein drug complex using GROMACS . The structure we used here is Cryo EM structure of RdRp from SARS CoV2(PDB ID 6m71) . This drug molecule has been effective against HCV virus and is under clinical trial . The present Molecular Dynamic (MD) simulation studies will provide insights into protein drug interaction and a closer view of the interacting residues present in the active site of RdRp. The dynamics of binding site will be an important step in structure-based drug design of SARS CoV2.