Fmoc-4-Abz-OH is widely used in peptide synthesis as a building block, particularly for introducing fluorescent or UV-active labels into peptides. Its Abz (aminobenzoic acid) moiety serves as a fluorescent probe, enabling the study of peptide interactions, conformational changes, and enzymatic activity. This compound is also employed in solid-phase peptide synthesis (SPPS) due to its Fmoc protecting group, which can be easily removed under mild basic conditions, allowing for the stepwise assembly of peptides. Additionally, it is utilized in the development of peptide-based sensors and probes for biochemical research, aiding in the detection and analysis of biological processes. Its stability and compatibility with standard peptide synthesis protocols make it a valuable tool in both academic and industrial research.