Using COC(=O)c1cc(CO)cc(-c2ccccc2Cl)c1, BrC(Br)(Br)Br to produce COC(=O)c1cc(CBr)cc(-c2ccccc2Cl)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.