Used in the synthesis of dyes and pigments, particularly azo dyes, due to its ability to form stable colored complexes. It acts as an intermediate in the production of organic colorants for textiles, inks, and coatings. Also employed in the preparation of certain pharmaceuticals and as a building block in organic synthesis for constructing more complex aromatic structures. Its hydroxyl and carboxylic acid groups allow for functional modifications, making it valuable in research and industrial chemistry for developing specialty chemicals.