Using CCOc1ccc(C2(CC(O)Cc3cccc(Oc4ccccc4)c3)CC2)cc1 to produce CCOc1ccc(C2(CC(=O)Cc3cccc(Oc4ccccc4)c3)CC2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.