Using CC1=C(C)C(=O)C(C(C)(C)CC(=O)Nc2ccc(CO)cc2)=C(C)C1=O, BrC(Br)(Br)Br to produce CC1=C(C)C(=O)C(C(C)(C)CC(=O)Nc2ccc(CBr)cc2)=C(C)C1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.