Used as an intermediate in the synthesis of azo dyes, which are widely applied in the textile industry for coloring fabrics. It plays a key role in producing vibrant and durable dyes due to its ability to form stable diazo compounds. Additionally, it is utilized in the manufacture of pharmaceuticals, particularly in the development of certain drugs that require sulfonic acid derivatives. Its properties also make it suitable for use in research and development of new chemical compounds with potential industrial or medical applications.