Using CCCC(=O)C1(CCCc2ccccc2)c2ccccc2-c2ccccc21 to produce CCCC(O)C1(CCCc2ccccc2)c2ccccc2-c2ccccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.