Using O=C(Cl)c1ccc(Cl)c(Cl)c1, CCOC(=O)C(C)(C)Br to produce CCOC(=O)C(C)(C)C(=O)c1ccc(Cl)c(Cl)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.