This chemical is widely used in bioconjugation and labeling applications due to its PEG (polyethylene glycol) spacer, which enhances solubility and reduces immunogenicity. It serves as a linker in the development of antibody-drug conjugates (ADCs), enabling the attachment of cytotoxic drugs to antibodies for targeted cancer therapy. Additionally, it is utilized in peptide synthesis to modify peptides, improving their stability and pharmacokinetic properties. The carboxylic acid group allows for further functionalization, making it a versatile tool in the creation of biosensors and diagnostic probes. Its application extends to surface modification of nanoparticles, enhancing their biocompatibility and circulation time in biomedical research.