Used primarily in peptide synthesis, this compound serves as a protected form of cysteine, ensuring the thiol group remains stable during reactions. It is particularly valuable in creating complex peptides and proteins where cysteine residues are essential. The benzyl (Bzl) group protects the thiol functionality, preventing unwanted side reactions, while the methyl ester (OMe) facilitates solubility and handling. After synthesis, the protecting groups can be removed to reveal the free cysteine residue, enabling the formation of disulfide bonds critical for protein structure and function. Its application is common in pharmaceutical research, especially in developing therapeutic peptides and studying protein folding mechanisms.