Used in bioconjugation and drug delivery systems, it serves as a linker molecule for attaching therapeutic agents or imaging probes to biomolecules like proteins, peptides, or antibodies. Its NHS ester group enables efficient coupling with amine-containing compounds, while the PEG spacer enhances solubility and reduces steric hindrance. Commonly applied in the development of antibody-drug conjugates (ADCs) and targeted therapies, it facilitates precise delivery of drugs to specific cells or tissues. Additionally, it is utilized in the synthesis of peptide-based vaccines and diagnostic tools, improving stability and bioavailability of the final product.