Using C[C@@H]1OC(=O)[C@@H](NC(=O)OC(C)(C)C)CCC[C@H](CCO)[C@H]1Oc1ccccc1, BrC(Br)(Br)Br to produce C[C@@H]1OC(=O)[C@@H](NC(=O)OC(C)(C)C)CCC[C@H](CCBr)[C@H]1Oc1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.