Used in bioconjugation and molecular labeling due to its ability to link biomolecules with high specificity. The biotin group enables strong binding to streptavidin or avidin, making it ideal for detection and purification in immunoassays, ELISA, and flow cytometry. The octaethylene glycol spacer enhances solubility and reduces non-specific binding, while the amino groups allow covalent attachment to proteins, nucleic acids, or surfaces. Commonly applied in probe development, diagnostic kits, and targeted drug delivery systems.