Using COc1nccc2nc(-c3ccc(C4OCCO4)cc3)c(-c3ccccc3)cc12 to produce COc1nccc2nc(-c3ccc(C=O)cc3)c(-c3ccccc3)cc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.