Z-Lys(Boc)-OSU is widely used in peptide synthesis as a protecting group for lysine residues. The Boc (tert-butyloxycarbonyl) group shields the amino group of lysine, preventing unwanted reactions during peptide chain assembly. The active ester (OSU) facilitates efficient coupling with other amino acids or peptides, ensuring high yields and purity. This compound is particularly valuable in solid-phase peptide synthesis (SPPS), where it helps create complex peptides with precise sequences. It is also employed in the preparation of peptide-based drugs, biomaterials, and research tools, where controlled lysine incorporation is essential. Its stability and reactivity make it a preferred choice in both academic and industrial settings.