Using COc1ccc(COCC2=CO[C@@H](OC)[C@@H]3C(CO)=CC[C@H]23)cc1 to produce COc1ccc(COCC2=CO[C@@H](OC)[C@@H]3C(C=O)=CC[C@H]23)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.