Using CC(C)(C)OC(=O)CN(CCO)[C@@H](Cc1c[nH]c2ccccc12)C(=O)OC(C)(C)C, O=C1CCC(=O)N1Br to produce CC(C)(C)OC(=O)CN(CCBr)[C@@H](Cc1c[nH]c2ccccc12)C(=O)OC(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.