Using COc1ccc(-c2cc(=O)c3c(OC)cc(OC)cc3o2)cc1 to produce COc1ccc(-c2cc(=O)c3c(O)cc(OC)cc3o2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.