(1S,2S)-2-((((9H-Fluoren-9-yl)methoxy)carbonyl)amino)cyclopentanecarboxylic acid is primarily used in peptide synthesis. It serves as a protected amino acid derivative, where the Fmoc (fluorenylmethoxycarbonyl) group acts as a protecting group for the amine functionality. This allows for selective deprotection during solid-phase peptide synthesis, enabling the stepwise construction of peptides. The compound is particularly valuable in the synthesis of complex peptides and proteins, where precise control over the sequence and protection of amino acids is critical. Its application is common in pharmaceutical research, biotechnology, and the development of therapeutic peptides.