H-Thr(Bzl)-OH is primarily used in peptide synthesis as a protected form of threonine. The benzyl (Bzl) group protects the hydroxyl side chain during the peptide assembly process, preventing unwanted reactions. This protection is crucial for the selective formation of peptide bonds, ensuring the correct sequence and structure of the synthesized peptide. After the peptide chain is assembled, the benzyl group can be removed through deprotection methods, revealing the free hydroxyl group of threonine. This compound is particularly valuable in the production of complex peptides and proteins for research, pharmaceuticals, and biotechnology applications.