Using CC(=O)Oc1ccc(C(=O)Oc2ccc(C(=O)OCc3ccccc3)cc2)cc1 to produce O=C(OCc1ccccc1)c1ccc(OC(=O)c2ccc(O)cc2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.