Using O=C(O)C1CN(C(=O)OCc2ccccc2)CCN1C(=O)OCc1ccccc1 to produce O=C(OCc1ccccc1)N1CCN2C(=O)OCC2C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.