Using O=C(OCC1c2ccccc2-c2ccccc21)C1CC(=O)N(O)C1=O, NCc1ccc(C(=O)O)cc1 to produce O=C(NCc1ccc(C(=O)O)cc1)OCC1c2ccccc2-c2ccccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.