This compound is Fmoc-L-Ala-L-Trp-OH, a protected dipeptide building block widely used in solid-phase peptide synthesis (SPPS). It facilitates the incorporation of the L-alanine-L-tryptophan sequence into peptide chains. The Fmoc group temporarily protects the N-terminal amine, enabling stepwise peptide assembly under mild basic conditions. The specified (S,S) stereochemistry ensures chirality control, essential for synthesizing biologically active peptides. Commonly employed in SPPS for preparing complex peptides and proteins in drug development, biochemistry, and molecular biology research. The indole side chain of tryptophan remains stable during Fmoc deprotection with piperidine, making it ideal for producing tryptophan-containing peptides such as hormones, antimicrobial agents, and signaling molecules.