Using O=C1CN(C(=O)OCc2ccccc2)CCN1, CC(C)(C)OC(=O)CBr to produce CC(C)(C)OC(=O)CN1CCN(C(=O)OCc2ccccc2)CC1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.