Used as a key intermediate in the synthesis of pharmaceutical compounds, particularly in the development of biologically active molecules and peptide-based drugs. Its protected amine and carboxylic acid functional groups allow for selective reactions in multi-step organic syntheses. Commonly employed in medicinal chemistry for building constrained cyclic structures that enhance metabolic stability and receptor selectivity. Also utilized in the preparation of protease inhibitors and other therapeutic agents where ring rigidity influences potency and pharmacokinetic properties.