Using BrC(Br)(Br)Br, CC(C)(C)OC(=O)NC[C@H]1CC[C@H](CO)CC1 to produce CC(C)(C)OC(=O)NC[C@H]1CC[C@H](CBr)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.