Phthalimidylbenzenesulfonyl chloride is a multifunctional dye important in both scientific research and clinical diagnostics. It aids in observing cell structures, tracking biomolecules, evaluating cell functions, distinguishing cell types, detecting biomolecules, studying tissue pathology, and monitoring microorganisms. Additionally, dyes are widely used in traditional textile dyeing, functional textile processing, food pigments, and dye-sensitized solar cells.