This chemical is widely used in peptide synthesis, particularly in solid-phase peptide synthesis (SPPS). It serves as a protected amino acid derivative, where the Fmoc group protects the amino terminus, and the Dde group protects the side chain of lysine. This dual protection allows for selective deprotection, enabling the synthesis of complex peptides with specific sequences. It is especially valuable in the synthesis of peptides containing multiple lysine residues, as it provides orthogonal protection strategies. Additionally, it is utilized in the preparation of peptide-based drugs, biomaterials, and research tools, where precise control over peptide structure is essential. Its application extends to the development of peptide libraries for drug discovery and biochemical studies.