Using O=C(CCCCCCCCCCCCC(=O)ON1C(=O)CCC1=O)OCc1ccccc1 to produce O=C(O)CCCCCCCCCCCCC(=O)ON1C(=O)CCC1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.