Used in bioconjugation processes to link biomolecules with other entities, enhancing drug delivery systems and therapeutic efficacy. It is particularly valuable in modifying proteins, peptides, and antibodies, enabling targeted treatments. The azide group allows for click chemistry reactions, facilitating efficient and selective coupling. Its PEG spacer improves solubility and reduces immunogenicity, making it suitable for biomedical applications such as cancer therapy and diagnostics. Additionally, it aids in surface functionalization for biosensors and tissue engineering scaffolds.