Used as an intermediate in the synthesis of pharmaceuticals, particularly in the development of peptidomimetics and bioactive molecules. Its protected amine group and ester functionality allow selective reactions in multi-step organic syntheses. Commonly employed in medicinal chemistry for constructing constrained amino acid derivatives that enhance metabolic stability and conformational rigidity in drug candidates. Also utilized in the preparation of enzyme inhibitors and receptor ligands where stereochemistry and ring structure influence biological activity.