Using CCCC[C@H]1CO[C@H](c2ccc(C=O)cc2)OC1, BrC(Br)(Br)Br to produce CCCC[C@H]1CO[C@H](c2ccc(C=C(Br)Br)cc2)OC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.