Fmoc-D-Ile-OH is widely used in peptide synthesis, particularly in solid-phase peptide synthesis (SPPS). It serves as a protected amino acid building block, where the Fmoc (fluorenylmethyloxycarbonyl) group protects the amine functionality during the assembly of peptide chains. This allows for the selective deprotection and coupling of amino acids in a controlled manner. Its application is crucial in the production of custom peptides for research, pharmaceuticals, and biotechnology, enabling the creation of peptides with specific sequences and properties. Additionally, it is valuable in the synthesis of peptidomimetics and other bioactive molecules.