Using CCc1ccc(-c2ccc(Cl)cc2)cc1C1C(=O)C=CC1O to produce CCc1ccc(-c2ccc(Cl)cc2)cc1C1C(=O)C=CC1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.