(a)
(b)
Figure 5: Structures of common derivatizing agents used in HPLC with UV or fluorescence detectors. (a) Dansyl chloride. (B) 4-(N-Chloroformylmethyl-N-methyl) amino-7-N,N-dimethylaminosulphonyl-2,1,3-benzoxadiazole (DBD-COCl).