Using CCOC(=O)C1CC(c2ccc(Cl)c(Cl)c2)c2ccccc2C1=O to produce CCOC(=O)C1Cc2ccccc2C(c2ccc(Cl)c(Cl)c2)C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.