Used as a chiral building block in the synthesis of pharmaceuticals, particularly in the development of biologically active compounds where stereochemistry plays a critical role. Its rigid isoindoline scaffold contributes to enhanced binding selectivity in drug candidates. Commonly employed in asymmetric synthesis and medicinal chemistry for CNS agents, kinase inhibitors, and protease inhibitors. The hydrochloride salt form improves stability and solubility, facilitating handling in reaction processes and formulation.