Using O=Cc1ccc(Cl)cc1, COC(=O)C1(C(C)C)CCCC1=O to produce COC(=O)C1(C(C)C)CCC(=Cc2ccc(Cl)cc2)C1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.