Using O=C(OCc1ccccc1)C(C1CCOCC1)C(O)(C(=O)OCc1ccccc1)C1CCOCC1 to produce O=C(O)C(C1CCOCC1)C(O)(C(=O)O)C1CCOCC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.