Used as a chiral building block in the synthesis of pharmaceuticals, particularly in the development of biologically active compounds where stereochemistry plays a critical role. Its rigid, saturated heterocyclic structure with a sulfur atom enhances binding selectivity and metabolic stability in drug candidates. Commonly employed in medicinal chemistry for peptidomimetics and enzyme inhibitors, especially in central nervous system agents and antiviral drugs. Also serves as an intermediate in the preparation of complex molecules requiring a constrained amine scaffold with defined stereochemistry.