Used extensively in bioconjugation and drug delivery systems, it serves as a linker to attach therapeutic agents to targeting molecules or nanoparticles. Its hydrophilic PEG chains enhance solubility and stability of the conjugates, reducing immunogenicity and extending circulation time in the body. Commonly applied in the development of antibody-drug conjugates (ADCs) and targeted cancer therapies, it enables precise delivery of drugs to specific cells or tissues. Additionally, it finds utility in the modification of proteins, peptides, and other biomolecules for research and therapeutic purposes. Its versatility and biocompatibility make it a valuable tool in pharmaceutical and biomedical applications.