Using CC(C)(C)CC(C)(C)c1ccc(OCCOCCOC2CCCCO2)c(CO)c1 to produce CC(C)(C)CC(C)(C)c1ccc(OCCOCCOC2CCCCO2)c(C=O)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.