Used as a key intermediate in the synthesis of fluorescent dyes and probes due to its stable phthalimide groups, which contribute to strong fluorescence properties. Commonly applied in bioimaging and labeling of biomolecules, where its structure allows for easy conjugation with proteins or nucleic acids. Also utilized in the development of photoactive polymers and sensors for detecting metal ions in environmental and biological systems. Its bifunctional nature enables cross-linking in polymer chemistry, enhancing material stability and performance.