Using CCOC(=O)[C@@H]1CCN(C(=O)OC(C)(C)C)C[C@H]1NC(=O)CCCCBr to produce CCOC(=O)[C@@H]1CCN(C(=O)OC(C)(C)C)C[C@H]1N1CCCCC1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.