Used primarily 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. The malonic acid moiety can act as a linker or spacer, enabling conjugation to other molecules or solid supports. Commonly employed in the preparation of peptide libraries, bioconjugates, and modified amino acids for pharmaceutical research. Its structure supports mild deprotection conditions, making it compatible with sensitive substrates in solid-phase and solution-phase synthesis.