Used in bioconjugation and labeling applications, it serves as a versatile linker for attaching fluorescent probes to biomolecules. The azide group enables click chemistry reactions, particularly with alkynes, facilitating efficient and selective coupling. The fluorescein moiety provides strong fluorescence, making it ideal for imaging and tracking in cellular and molecular studies. Its PEG3 spacer enhances solubility and reduces steric hindrance, improving binding efficiency. Commonly applied in drug delivery systems, diagnostics, and research tools for visualizing and analyzing biological processes.