Used as a chiral building block in the synthesis of pharmaceuticals, particularly in the development of active pharmaceutical ingredients (APIs) where stereochemistry plays a critical role in biological activity. Its rigid cyclic structure and functional groups make it valuable for modifying molecular conformation and improving metabolic stability in drug candidates. Commonly employed in the preparation of protease inhibitors and other bioactive molecules requiring high enantiomeric purity. Also utilized in asymmetric synthesis to introduce chirality into complex molecules.