Widely used in peptide synthesis as a protected amino acid building block. The Fmoc group provides temporary protection for the amine function, allowing selective reaction at other sites during stepwise assembly of peptides. Its stability under acidic conditions and easy removal under mild basic conditions (e.g., piperidine in DMF) makes it ideal for solid-phase peptide synthesis (SPPS). The cyclohexyl side chain imparts hydrophobic character, useful for studying structure-activity relationships in peptide design. Commonly employed in the preparation of biologically active peptides, peptidomimetics, and pharmaceutical intermediates.