This chemical is widely used in bioconjugation processes, where it serves as a linker to attach bioactive molecules, such as proteins or peptides, to other substances like polymers or surfaces. Its NHS ester group reacts efficiently with primary amines, enabling stable amide bond formation. The PEG (polyethylene glycol) spacer enhances solubility and reduces steric hindrance, making it ideal for creating biocompatible conjugates. It is particularly valuable in drug delivery systems, where it helps improve the pharmacokinetics and stability of therapeutic agents. Additionally, it is employed in the development of diagnostic tools, such as fluorescent probes or antibody labeling, for research and medical applications.