Used as an intermediate in the synthesis of dyes and pigments, particularly in azo dye production due to the presence of both aldehyde and phenolic functional groups. The compound plays a key role in coupling reactions where it contributes to chromophore formation, enhancing color intensity and stability in textile dyes. It is also utilized in the preparation of functionalized aromatic compounds for pharmaceuticals and agrochemicals, where the sulfonate group improves water solubility and reactivity. Its aldehyde group allows for further derivatization, making it valuable in organic synthesis and industrial chemical manufacturing.