Using CN1C(=O)C2C3C=CC(CC3)C2(c2ccc(Cl)c(Cl)c2)C1=O to produce CN1C(=O)C2C3CCC(CC3)C2(c2ccc(Cl)c(Cl)c2)C1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.