Z-LYS-SBZL HCl is primarily used in peptide synthesis as a protecting group for lysine residues. Its application is crucial in preventing unwanted side reactions during the formation of peptide bonds, ensuring the synthesis proceeds efficiently. This compound is particularly valuable in the production of complex peptides and proteins, where selective protection and deprotection of amino acids are necessary. Additionally, it finds use in biochemical research for studying enzyme-substrate interactions and protein folding, as it allows for precise control over the chemical environment of lysine residues. Its stability and ease of removal make it a preferred choice in both industrial and academic settings for advanced peptide chemistry.