Using O=[N+]([O-])c1cnc(-n2cc3ccccc3n2)nc1Nc1ccc(Cl)cc1 to produce Nc1cnc(-n2cc3ccccc3n2)nc1Nc1ccc(Cl)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.