Used as a chiral building block in the synthesis of peptide-based pharmaceuticals and bioactive molecules. Its azetidine ring provides structural rigidity, enhancing metabolic stability and influencing conformational preferences in peptide analogs. The Fmoc group allows for solid-phase peptide synthesis, enabling stepwise assembly of complex peptides. Commonly employed in medicinal chemistry for developing enzyme inhibitors and receptor modulators, particularly where stereochemistry plays a critical role in biological activity.