Using O=C(Oc1ccc(C(=O)OCc2ccccc2)c(OCc2ccccc2)c1)c1ccccc1 to produce O=C(OCc1ccccc1)c1ccc(O)cc1OCc1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.