Using COC(=O)C1(c2ccc(COc3cccc(C(=O)c4ccccc4)c3)cc2)CC1 to produce COC(=O)C1(c2ccc(COc3cccc(C(O)c4ccccc4)c3)cc2)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.