Used as a chiral building block in the synthesis of pharmaceuticals, particularly in the development of antiviral and antitumor agents. Its structural features allow for selective interactions in biological systems, making it valuable in asymmetric synthesis. Commonly employed in the preparation of enzyme inhibitors and bioactive molecules where stereochemistry plays a critical role in activity. Also utilized in the design of novel therapeutic compounds targeting central nervous system disorders due to its ability to cross biological membranes and mimic natural neurotransmitters.