Used as an intermediate in organic synthesis, particularly in the preparation of bioactive molecules and pharmaceuticals. Its structure contains a reactive isoindoline-dione moiety and an ester functional group, making it suitable for conjugation reactions and ring-forming transformations. Commonly employed in the development of proteolysis-targeting chimeras (PROTACs), where it serves as a linker component to connect target-binding ligands with E3 ubiquitin ligase recruiters. Also utilized in medicinal chemistry for building complex heterocyclic systems due to its ability to undergo nucleophilic substitution, hydrolysis, and reduction under controlled conditions.