This bifunctional chemical, with an amino group at one terminus and a carboxylic acid group at the other connected by ten ethylene oxide units in a polyethylene glycol (PEG) chain, is primarily used in bioconjugation and drug delivery. The PEG segments enhance solubility and biocompatibility, making it ideal for modifying proteins, peptides, and other biomolecules to improve stability and reduce immunogenicity. The amino and carboxylic acid groups enable versatile conjugation chemistries, such as amide bond formation. It is also employed in targeted drug delivery systems to prolong circulation time of therapeutics and in creating complex conjugates for diagnostic and therapeutic applications.