Fmoc-Ida-OH is widely used in peptide synthesis as a protecting group for amino acids. It is particularly valuable in solid-phase peptide synthesis (SPPS) where the Fmoc group protects the amino group during the coupling reactions. The Fmoc group can be easily removed under mild basic conditions, making it a preferred choice for constructing complex peptides. Additionally, it is employed in the synthesis of peptide-based drugs, biomaterials, and research tools due to its stability and compatibility with various chemical reactions. Its application extends to the development of peptide libraries for drug discovery and the study of protein-protein interactions.