Fmoc-Thr-OH is widely used in peptide synthesis, particularly in solid-phase peptide synthesis (SPPS) methods. It serves as a protected form of threonine, where the Fmoc (fluorenylmethyloxycarbonyl) group protects the amino group during the coupling reactions. This allows for the sequential addition of amino acids to build peptides with high precision. It is especially valuable in the production of complex peptides and proteins for research, pharmaceuticals, and biotechnology applications. The Fmoc group can be easily removed under mild basic conditions, making it a preferred choice for synthesizing sensitive peptides. Additionally, it is utilized in the development of peptide-based drugs, vaccines, and diagnostic tools due to its reliability and efficiency in peptide chain assembly.