Using CCCCOc1c(C(C)O)cc(C(C)(C)C)cc1C(C)(C)C to produce CCCCOc1c(C(C)=O)cc(C(C)(C)C)cc1C(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.