Used as an intermediate in the synthesis of vat dyes, particularly for producing blue and green shades in cotton and other cellulosic fibers. Plays a key role in the production of disperse dyes for polyester and acetate fabrics. Also utilized in the manufacture of certain pigments and fluorescent brightening agents. Its derivatives contribute to improved lightfastness and color stability in textile dyes. Additionally, it finds use in some photochemical applications due to its light-absorbing properties.