Using CCOC(=O)CCC(=O)c1ccc(CCNS(=O)(=O)c2cccc(Cl)c2)cc1 to produce O=C(O)CCC(=O)c1ccc(CCNS(=O)(=O)c2cccc(Cl)c2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.