Using O=[N+]([O-])[O-], O=C(Nc1ccc(OCc2ccccc2)c(F)c1)c1cnccn1 to produce O=C(Nc1cc(F)c(OCc2ccccc2)cc1[N+](=O)[O-])c1cnccn1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.