6-Carboxyrhodamine 110, succinimidyl ester, single isomer is widely used as a fluorescent labeling reagent in biochemical and biomedical research. Its primary application is in the labeling of proteins, peptides, and antibodies, enabling their detection and visualization in various assays. The succinimidyl ester group reacts efficiently with primary amines, facilitating covalent attachment to biomolecules. This compound is particularly valuable in fluorescence microscopy, flow cytometry, and immunofluorescence techniques, where its bright green fluorescence allows for high-sensitivity imaging and analysis. Additionally, it is employed in the development of fluorescent probes for studying cellular processes, protein interactions, and molecular dynamics. Its single isomer nature ensures consistent and reliable performance in these applications.