FMOC-ABU-OH is widely used in peptide synthesis as a protecting group for amino acids. Its primary application is in solid-phase peptide synthesis (SPPS), where the FMOC group protects the amino group of the amino acid during the coupling process. This allows for the sequential addition of amino acids to build peptides with high precision. The FMOC group can be easily removed under mild basic conditions, making it a preferred choice in peptide chemistry. Additionally, FMOC-ABU-OH is utilized in the synthesis of modified peptides and peptidomimetics, where the incorporation of non-natural amino acids like aminobutyric acid (ABU) is required. Its stability and ease of deprotection make it a valuable tool in the development of therapeutic peptides and bioactive molecules.