Used as a key intermediate in the synthesis of biologically active compounds, particularly in pharmaceutical development. Its protected amine and ester functional groups make it valuable in peptide synthesis and the construction of complex cyclic structures. Commonly employed in medicinal chemistry for building constrained amino acid analogs, which are useful for modulating peptide stability and receptor selectivity. Also utilized in the preparation of protease inhibitors and other therapeutic agents where ring strain and stereochemistry influence biological activity.