Using CNc1nc(OCC(F)F)c(C(=O)OC)cc1[N+](=O)[O-] to produce Nc1nc(OCC(F)F)c(C(=O)O)cc1[N+](=O)[O-], please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.