Using Cn1cc(C=O)cn1, Nc1nc(Nc2cc(Cl)cc(Cl)c2)n[nH]1 to produce Cn1cc(CNc2nc(Nc3cc(Cl)cc(Cl)c3)n[nH]2)cn1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.