Fmoc-Val-OSu is widely used in peptide synthesis as a protecting group for amino acids. It is particularly effective in solid-phase peptide synthesis (SPPS) where the Fmoc group protects the amino group of valine, allowing selective deprotection under mild basic conditions. This reagent is essential for constructing complex peptides with high precision, as it ensures the correct sequence of amino acids is maintained. Additionally, it is employed in the preparation of peptide libraries for drug discovery and biochemical research. Its stability and ease of removal make it a valuable tool in organic and medicinal chemistry for developing therapeutic peptides and studying protein interactions.