Using O=C(O)c1ccc(-c2ncccc2C(F)(F)F)cc1[N+](=O)[O-] to produce Nc1cc(-c2ncccc2C(F)(F)F)ccc1C(=O)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.