Used primarily as an intermediate in the synthesis of dyes and pigments, particularly in the production of azo dyes. It serves as a coupling component in dye formation, contributing to the development of vibrant and stable colorants for textiles, inks, and coatings. Also employed in the manufacture of sulfa drugs and other pharmaceuticals due to its sulfonic acid group, which enhances solubility and bioavailability. Additionally, it finds use in chemical research as a derivatizing agent for analytical purposes, especially in chromatography and spectrometry, where it helps detect and quantify compounds with hydroxyl or amino groups.