Using CCc1ccc(-c2ccc(Cl)cc2)cc1C1=C(OC)CCC1=O to produce CCc1ccc(-c2ccc(Cl)cc2)cc1C1C(=O)CCC1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.