Used as an intermediate in the synthesis of azo dyes and pigments, particularly for producing yellow and orange shades with good lightfastness. It plays a key role in the textile industry for dyeing polyester, nylon, and acrylic fibers. Also utilized in the production of optical brighteners for detergents and paper, enhancing whiteness by absorbing UV light and emitting blue fluorescence. Additionally, it serves as a building block in some pharmaceutical syntheses, especially in compounds requiring naphthalene-based structures. Its amino and carboxylic functional groups allow for easy modification and coupling reactions in organic synthesis.