Using O=C1C(=Cc2ccccc2)CCc2c1[nH]c1ccc(Cl)c(Cl)c21 to produce O=C1c2[nH]c3ccc(Cl)c(Cl)c3c2CCC1Cc1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.