Using O=C(Nc1cncc2[nH]c3ccc(Cl)cc3c12)C(F)(F)F, O=N[O-] to produce O=C(Nc1cncc2[nH]c3c([N+](=O)[O-])cc(Cl)cc3c12)C(F)(F)F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.