Used in peptide synthesis, particularly in the development of bioactive peptides and pharmaceutical research. Its D-configuration enhances resistance to enzymatic degradation, improving peptide stability in biological systems. The Fmoc group enables solid-phase peptide synthesis through orthogonal protection strategies, allowing stepwise assembly of complex peptide sequences. The thienyl side chain provides a unique aromatic moiety that can influence peptide conformation and interaction with biological targets, making it valuable in structure-activity relationship studies. Commonly employed in the design of enzyme inhibitors, receptor ligands, and peptidomimetics.