Used in peptide synthesis, particularly in the development of constrained peptides and peptidomimetics. Its azetidine ring introduces structural rigidity, enhancing metabolic stability and improving binding selectivity in drug design. The Fmoc group allows for solid-phase synthesis using standard Fmoc-strategy protocols, making it compatible with automated peptide synthesizers. Commonly employed in medicinal chemistry for creating bioactive molecules with improved pharmacokinetic profiles.