Using Cl, Nc1c(-c2ccc(Cl)cc2)c(-c2ccc(Cl)cc2Cl)nc2c1cnn2-c1ccccc1 to produce Clc1ccc(-c2c(-c3ccc(Cl)cc3Cl)nc3c(cnn3-c3ccccc3)c2Cl)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.