Using O=[N+]([O-])O, O=C(O)c1cccc(Oc2ccc(C(F)(F)F)cc2Cl)c1 to produce O=C(O)c1cc(Oc2ccc(C(F)(F)F)cc2Cl)ccc1[N+](=O)[O-], please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.