Widely used in the synthesis of complex organic molecules, particularly in the field of bioconjugation and drug delivery systems. Its structure, featuring a tert-butyl carbamate group and a polyethylene glycol (PEG) chain, makes it highly effective for modifying proteins, peptides, and other biomolecules to enhance their solubility, stability, and biocompatibility. Commonly applied in the development of therapeutic agents, where it serves as a linker or spacer to attach drugs to targeting moieties, improving their pharmacokinetic properties. Additionally, it is utilized in the preparation of hydrogels and other biomaterials for tissue engineering and regenerative medicine due to its ability to impart water solubility and reduce immunogenicity.