Using O=C([O-])[O-], CCOC(=O)C1CN(C(=O)OCc2ccccc2)CC1=O to produce CCOC(=O)C1(C)CN(C(=O)OCc2ccccc2)CC1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.