Used as a key chiral intermediate in the synthesis of pharmaceutical agents, particularly in the development of protease inhibitors and antiviral drugs. Its chiral cyclopropylamine structure enables selective binding in biological systems, making it valuable in optimizing drug efficacy and metabolic stability. Commonly employed in the preparation of hepatitis C virus (HCV) NS3/4A protease inhibitors due to its ability to enhance potency and pharmacokinetic properties. The hydrochloride salt form improves solubility and handling during drug formulation processes.