Using CC(C)(C)OC(=O)N(C(=O)OC(C)(C)C)c1ncc(CO)cn1, BrC(Br)(Br)Br to produce CC(C)(C)OC(=O)N(C(=O)OC(C)(C)C)c1ncc(CBr)cn1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.