Using O=Cc1ccccc1, Nc1nc(Nc2cc(Cl)cc(Cl)c2)n[nH]1 to produce Clc1cc(Cl)cc(Nc2n[nH]c(NCc3ccccc3)n2)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.