Using CCOC(=O)C1CCN(c2nccc3nc(NCc4ccccc4Cl)ncc23)CC1 to produce O=C(O)C1CCN(c2nccc3nc(NCc4ccccc4Cl)ncc23)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.