Used as a key intermediate in the synthesis of pharmaceuticals, particularly in the development of proteolysis-targeting chimeras (PROTACs). Its structure enables effective linker functionality, connecting target-binding ligands to E3 ubiquitin ligase ligands, facilitating targeted protein degradation. Commonly employed in research for oncology and neurodegenerative disease drug development. Also utilized in the preparation of fluorescent probes due to its stable isoindoline core, supporting applications in bioimaging and molecular sensing.