This chemical is primarily used in peptide synthesis, particularly in solid-phase peptide synthesis (SPPS). It serves as a protected form of cysteine, where the S-((9H-fluoren-9-yl)methyl) group acts as a protecting group for the thiol side chain, and the N-((allyloxy)carbonyl) group protects the amino group. This dual protection allows for selective deprotection during the synthesis process, enabling the precise construction of complex peptides. The compound is especially valuable in the synthesis of peptides containing cysteine residues, which are critical for forming disulfide bonds that contribute to the structural stability and function of many biologically active peptides and proteins. Its use ensures high efficiency and purity in peptide production, making it a key reagent in biochemical research and pharmaceutical development.