Used in peptide synthesis as a building block, particularly for introducing hydrophilic spacers or linkers. It helps in creating peptide conjugates with improved solubility and bioavailability. Commonly employed in solid-phase peptide synthesis (SPPS) to incorporate non-natural amino acids or functional groups. Its Fmoc group allows for selective deprotection during synthesis, ensuring precise control over the peptide sequence. Applied in the development of drug delivery systems, bioconjugates, and biomaterials due to its ability to enhance stability and functionality.