Used in peptide synthesis as a protecting group for cysteine residues. The Boc group shields the amino group, while the pMeOBzl protects the thiol group, ensuring selective reactions during peptide chain assembly. Commonly employed in solid-phase peptide synthesis (SPPS) to prevent unwanted side reactions. Its stability under acidic conditions makes it suitable for stepwise elongation of peptides. After synthesis, the protecting groups can be selectively removed to yield the desired peptide sequence.