This compound, N-Carbobenzoxy-S-phenyl-L-cysteine, is a protected derivative of L-cysteine primarily used in peptide synthesis. The carbobenzoxy (Cbz) group protects the amino functionality, while the S-phenyl group shields the thiol group of cysteine, preventing unwanted side reactions during peptide bond formation. This dual protection is crucial in solid-phase peptide synthesis, enabling selective deprotection and the controlled assembly of complex peptides. Additionally, it is utilized in biochemical research to investigate protein structure and function, particularly where cysteine is involved in disulfide bond formation or enzymatic activity. Its stability across various reaction conditions makes it a reliable reagent for synthetic and analytical applications in organic chemistry and biochemistry.