Using CCOC(=O)CCCN1CCc2ccc(S(=O)(=O)Nc3cccc(Cl)c3)cc2C1 to produce O=C(O)CCCN1CCc2ccc(S(=O)(=O)Nc3cccc(Cl)c3)cc2C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.