Application: Dansyl chloride (CAS NO.605-65-2 ) functions as a fluorogenic reagent employed in reverse-phase high-performance liquid chromatography (HPLC) for the detection of proteins, N-terminal amino acids, and peptides. Additionally, it plays a crucial role in assessing the degree of labeling in substances such as chymotrypsin and ovalbumin. Beyond its direct applications, Dansyl chloride serves as a precursor for synthesizing various derivatives, including dansyl amide.