Used as a derivatizing agent in analytical chemistry, particularly for the detection and quantification of primary and secondary amines. It reacts selectively with amine groups to form stable, colored sulfonamide derivatives that can be easily detected using UV-Vis or HPLC methods. Commonly applied in the analysis of amino acids, peptides, and pharmaceutical compounds where sensitive detection is required. Its strong electron-withdrawing nitro groups enhance chromophoric properties, improving detection sensitivity. Also employed in some industrial processes as an intermediate in the synthesis of dyes and sulfonate-based compounds.