Using CCOC(CCC(C)C)c1cc(OC)c2c(OC)ccc(OC)c2c1OC to produce CCOC(CCC(C)C)C1=CC(=O)c2c(OC)ccc(OC)c2C1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.