Using COc1ccc(-c2n[nH]c3c2C(=O)c2ccccc2-3)cc1OC to produce COc1ccc(-c2n[nH]c3c2C(O)c2ccccc2-3)cc1OC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.