Used in the synthesis of azo dyes and hair dye formulations due to its ability to form colored compounds through diazotization and coupling reactions. Commonly employed as an intermediate in pharmaceuticals for the production of analgesics, antipyretics, and antioxidants. Also utilized in the development of photographic developers, polymerization inhibitors, and applications in textiles, leather, and printing inks. Its hydrochloride salt form enhances stability and solubility in aqueous systems, making it suitable for industrial processes requiring water-based reactions.