This chemical is primarily used in the field of bioconjugation and chemical biology. It serves as a versatile linker for attaching various functional groups, particularly in the development of drug delivery systems and targeted therapies. Its structure, featuring a propargyl group and PEG spacers, allows for efficient click chemistry reactions, enabling the conjugation of biomolecules such as proteins, peptides, or antibodies. Additionally, it is utilized in the synthesis of polymer-based materials and nanoparticles, where its PEG chains enhance solubility and biocompatibility. The t-butyl ester group provides stability during synthesis and can be selectively removed to expose reactive sites for further modifications. This makes it valuable in creating tailored biomaterials for applications in diagnostics, therapeutics, and biomedical research.