Using COc1ccc(COC(=O)c2cccc(OCc3ccc(OC)cc3)c2OCc2ccc(OC)cc2)cc1 to produce COc1ccc(COc2cccc(C(=O)O)c2OCc2ccc(OC)cc2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.