This chemical is primarily used in peptide synthesis, particularly in solid-phase peptide synthesis (SPPS). It serves as a protected cysteine derivative, where the Fmoc group protects the amino group, and the MMt (methyltrityl) group protects the thiol side chain of cysteine. This dual protection ensures selective deprotection during the synthesis process, allowing for the controlled addition of cysteine residues in peptide chains. It is especially valuable in synthesizing peptides with complex structures, such as those containing disulfide bonds, which are critical in proteins and bioactive peptides. The compound is widely utilized in pharmaceutical research and development for creating peptides with specific biological activities.