Used in solid-phase peptide synthesis as a protected cysteine derivative, enabling selective disulfide bond formation. The trityl group protects the thiol functionality, preventing unwanted oxidation, while the Fmoc group allows for stepwise elongation of the peptide chain. The glycine linker with a thiol-protecting group is particularly useful in synthesizing complex peptides with multiple cysteine residues, ensuring correct pairing and structural fidelity. Commonly applied in the production of therapeutic peptides and biochemical probes where precise disulfide bridge formation is critical.