Using O=C(OCc1ccccc1)c1ccc(OCC2CN(C(=O)c3ccccc3)C(=O)O2)cc1 to produce O=C(O)c1ccc(OCC2CN(C(=O)c3ccccc3)C(=O)O2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.