Used in solid-phase peptide synthesis, particularly for the construction of complex peptides requiring orthogonal protection strategies. The Dde group serves as a selectively removable protecting group for the side chain of diamino butyric acid (Dab), allowing stepwise assembly without unintended deprotection. The Fmoc group ensures alpha-amino protection during chain elongation, compatible with standard Fmoc-based synthesis protocols. This compound is especially valuable in synthesizing branched or multiply modified peptides, such as those used in drug development, epitope mapping, and peptide-based vaccine design. Its selective deprotection characteristics enable site-specific modifications like biotinylation or fluorescent labeling during peptide synthesis.