Using CCOC(=O)CC(C(=O)N1Cc2ccc(Cl)cc2C1)c1ccc(Cl)cc1 to produce O=C(O)CC(C(=O)N1Cc2ccc(Cl)cc2C1)c1ccc(Cl)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.