Used in peptide synthesis, particularly in solid-phase peptide synthesis (SPPS), to introduce protected cysteine residues into peptide chains. The Fmoc group provides temporary protection for the amino group, while the pMeOBzl group protects the thiol side chain of cysteine, preventing unwanted reactions during peptide assembly. This compound is essential for constructing peptides with specific disulfide bonds or thiol functionalities, which are critical in bioactive peptides and proteins. It is widely applied in pharmaceutical research, drug development, and the study of protein folding and interactions.