Using COC(=O)c1ccc2c(c1)CN(C(=O)OCc1ccccc1)C2 to produce O=C(O)c1ccc2c(c1)CN(C(=O)OCc1ccccc1)C2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.