. Add Spectra ( Help ). From Wikipedia 1-fluoro-2,4-dinitrobenzene , or Sanger's reagent (commonly called dinitrofluorobenzene or DNFB ), is a chemical used for polypeptide sequencing . Read more... Edit at Wikipedia... Other names 1-fluoro-2,4-dinitro-benzene (IUPAC Name); 2,4-Dinitro-1-fluorobenzene; 2,4-Dinitrofluorobenzene; 2,4-Dnbf; Sanger reagent; Sanger's Reagent References Please add any relevant references here.