Used as an intermediate in the synthesis of dyes and pigments, particularly in the production of anthraquinone-based colorants. It serves as a key building block for sulfonated anthraquinone derivatives, which are valued for their color fastness and stability in textile dyeing. Also employed in the development of functional organic materials, including photoactive compounds and electroactive polymers. Its sulfonic acid group enhances solubility in polar solvents, making it suitable for applications in aqueous dye formulations and industrial coloring processes.