This chemical is widely used in bioconjugation and protein modification due to its reactive functional groups. The terminal carboxylic acid group allows for easy coupling with amines, enabling the attachment of biomolecules like peptides, proteins, or antibodies. The PEG (polyethylene glycol) spacer enhances solubility and reduces steric hindrance, making it ideal for creating stable and biocompatible conjugates. It is particularly useful in drug delivery systems, where it helps improve the pharmacokinetics and bioavailability of therapeutic agents. Additionally, it is employed in the development of biosensors and diagnostic assays, where precise molecular labeling is required. Its versatility also extends to material science, where it is used to modify surfaces for enhanced biocompatibility.