Used in peptide synthesis as a protected amino acid building block, particularly in the development of pharmaceuticals and bioactive peptides. The Fmoc group provides temporary protection for the amino terminus, allowing stepwise assembly of peptides under mild basic conditions. Its D-histidine configuration with a methyl modification offers stereochemical stability and resistance to enzymatic degradation, making it valuable in designing metabolically stable peptide therapeutics. Commonly applied in solid-phase peptide synthesis (SPPS) for research in drug discovery, especially in oncology and endocrinology.