Used in peptide synthesis, particularly in solid-phase peptide synthesis (SPPS) as a building block. It provides orthogonal protection for amino groups, allowing selective deprotection during the synthesis of complex peptides. The Fmoc group protects the alpha-amino group, while the Dde group protects the side-chain amino group of diamino butyric acid (Dab). This enables sequential and controlled assembly of peptide chains, making it valuable in the production of peptides for research, pharmaceuticals, and biotechnology applications. Its use ensures high purity and efficiency in peptide synthesis processes.