Used as a chiral building block in organic synthesis, particularly in the development of pharmaceuticals and bioactive molecules. Its protected thiol groups and stereochemical integrity make it valuable in peptide mimetic design and asymmetric synthesis. Commonly employed in the preparation of cysteine-containing compounds where selective deprotection allows for controlled disulfide bond formation. Also utilized in medicinal chemistry for synthesizing enzyme inhibitors and probing structure-activity relationships in sulfur-rich peptides.