Used as a chiral building block in the synthesis of pharmaceuticals, particularly in the development of protease inhibitors and antiviral agents. Its free amine at the 3-position and Boc-protected amine at the 4-position allow selective reactions in multi-step organic syntheses. Commonly employed in the preparation of bioactive molecules where stereochemistry is critical for activity. Also utilized in the manufacture of kinase inhibitors and central nervous system therapeutics due to its favorable conformational and solubility properties.