Used as a chiral building block in the synthesis of pharmaceuticals, particularly in the development of active pharmaceutical ingredients (APIs) requiring high enantiomeric purity. Its structure supports the formation of complex molecules in drugs targeting neurological disorders, antiviral therapies, and diabetes treatments. Commonly employed in asymmetric synthesis due to its ability to direct stereoselective reactions. Also utilized in the preparation of protease inhibitors and other biologically active compounds where the (S)-configuration is critical for activity.