Used in the synthesis of azo dyes and pigments, particularly for producing dyes with bright shades and good lightfastness. Acts as an intermediate in the production of textile dyes, leather dyes, and paper colorants. Also employed in the manufacture of certain fluorescent whitening agents for detergents and paper. Its structure allows for easy coupling reactions, making it valuable in creating complex dye molecules. Additionally, it serves as a building block in some pharmaceuticals and agrochemicals where sulfonated aromatic amines are required.