Using COC(=O)C(O)C(OCCc1ccc(OC)c(OC)c1)(c1ccccc1)c1ccccc1 to produce COc1ccc(CCOC(c2ccccc2)(c2ccccc2)C(O)C(=O)O)cc1OC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.