This chemical is widely used in the field of bioconjugation and organic synthesis. It serves as a key building block for creating complex molecules, particularly in the development of pharmaceuticals and biomaterials. Its propargyl group enables click chemistry reactions, such as the copper-catalyzed azide-alkyne cycloaddition (CuAAC), which is essential for attaching functional groups or labeling biomolecules like proteins, peptides, and nucleic acids. Additionally, the PEG3 spacer enhances solubility and reduces steric hindrance, making it ideal for designing drug delivery systems and improving the pharmacokinetics of therapeutic agents. Its methyl ester group can be hydrolyzed or further modified, offering versatility in synthesizing targeted compounds for research and industrial applications.