Used in peptide synthesis, particularly in solid-phase peptide synthesis (SPPS), as a protected amino acid derivative. It helps in the incorporation of tryptophan residues into peptides while preventing unwanted side reactions. The Fmoc (fluorenylmethyloxycarbonyl) group acts as a temporary protecting group for the amino group, which can be removed under mild basic conditions. The methyl group on the indole ring of tryptophan enhances stability and can influence the peptide's biological activity or structural properties. This compound is valuable in the development of therapeutic peptides, research peptides, and in studying protein-protein interactions.