Using COc1ccccc1Br, O=C1Nc2cc(Cl)c(Cl)cc2C1=O to produce COc1ccccc1C1(O)C(=O)Nc2cc(Cl)c(Cl)cc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.