Using Nc1cccc([N+](=O)[O-])c1, Clc1nc(Cl)nc(Cl)n1 to produce O=[N+]([O-])c1cccc(Nc2nc(Cl)nc(Cl)n2)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.