Dibromobimane is widely used as a fluorescent labeling agent for thiol groups in proteins and peptides. It reacts selectively with cysteine residues, enabling the study of protein structure, folding, and interactions. This compound is particularly useful in biochemistry and molecular biology for tracking thiol-containing molecules in complex biological systems. Additionally, it aids in the analysis of redox states within cells, providing insights into cellular processes and oxidative stress. Its fluorescence properties make it a valuable tool for imaging and detection in various research applications.