Fmoc-D-Asn-OH is widely used in peptide synthesis, particularly in solid-phase peptide synthesis (SPPS) techniques. It serves as a building block for incorporating D-asparagine into peptide chains. The Fmoc (fluorenylmethyloxycarbonyl) group acts as a protective group for the amino acid’s amine functionality, ensuring selective reactions during peptide assembly. This compound is essential in the production of custom peptides for research in biochemistry, pharmaceuticals, and drug development. Its application is critical in creating peptides with specific sequences and structures, which are often used to study biological processes or develop therapeutic agents. Additionally, it is employed in the synthesis of peptidomimetics and other bioactive molecules.