Used as a key intermediate in the synthesis of azo dyes and pigments, particularly for producing high-performance textile dyes with excellent light and wash fastness. It is also employed in the manufacture of specialty polymers and polyimides, where its sulfonic acid groups enhance solubility and thermal stability. Commonly found in formulations for dyes used in polyester, nylon, and acrylic fibers. Additionally, it serves as a building block in the development of electroactive materials and conductive polymers due to its aromatic and functional group structure.