Using C=C(C(=O)c1ccc(OC)c(Cl)c1Cl)c1ccc(Br)cc1 to produce COc1cc2c(c(Cl)c1Cl)C(=O)C(c1ccc(Br)cc1)C2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.