Using COC(=O)C(Oc1ccc(CO)cc1OC)c1ccccc1, BrC(Br)(Br)Br to produce COC(=O)C(Oc1ccc(CBr)cc1OC)c1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.