This compound is widely used in peptide synthesis as a protecting group for cysteine residues. The Boc group safeguards the amino group, while the Trt group protects the thiol group of cysteine, preventing unwanted side reactions during peptide coupling. The active ester (OSu) facilitates efficient coupling with other amino acids or peptide fragments. It is particularly valuable in solid-phase peptide synthesis (SPPS) for constructing complex peptides or proteins, ensuring high purity and yield. Its stability under acidic conditions makes it suitable for stepwise synthesis, and it is often employed in the production of therapeutic peptides, research peptides, and bioconjugates.