Used in the synthesis of dyes and pigments, particularly for producing azo dyes that exhibit good light and wash fastness. Acts as an intermediate in the production of fluorescent whitening agents for textiles and paper. Employed in the development of analytical reagents for detecting metal ions due to its ability to form colored complexes. Also utilized in the preparation of certain pharmaceuticals and antioxidants. Its derivatives find use in organic semiconductors and electroactive materials for electronic applications.