Used in peptide synthesis, particularly in solid-phase peptide synthesis (SPPS) methodologies. It serves as a protected amino acid derivative of D-homocysteine, where the Fmoc group provides temporary protection for the amino group, and the Trt group protects the thiol side chain of D-homocysteine. This protection strategy is crucial for the stepwise construction of peptides, ensuring that reactions occur at the desired sites without interference from reactive side chains. It is especially valuable in synthesizing peptides containing D-homocysteine, which can be important in studying protein structure, function, and interactions. Additionally, it is employed in the development of peptide-based drugs and biomaterials, where precise control over peptide sequence and structure is essential.