Fmoc-Trp-OH is primarily used in peptide synthesis, particularly in solid-phase peptide synthesis (SPPS). It serves as a protected form of tryptophan, where the Fmoc group safeguards the amino group during the synthesis process. This allows for the sequential addition of amino acids to build peptides with high precision. The compound is essential in producing peptides for research, pharmaceuticals, and biotechnology applications, such as the development of therapeutic peptides, vaccines, and diagnostic tools. Its stability and compatibility with SPPS make it a valuable reagent in organic and medicinal chemistry laboratories.