Using CCOC(=O)C(=O)CCc1ccc(Cl)c(Cl)c1, NCc1ccccc1 to produce CCOC(=O)C(CCc1ccc(Cl)c(Cl)c1)NCc1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.