Propargyl-PEG7-alcohol is widely used in the field of bioconjugation and chemical biology due to its unique properties. It serves as a versatile linker molecule in the synthesis of complex biomolecules, enabling the attachment of various functional groups or targeting moieties to proteins, peptides, or other biomolecules. Its terminal alkyne group allows for efficient click chemistry reactions, such as the copper-catalyzed azide-alkyne cycloaddition (CuAAC), which is highly selective and biocompatible. This makes it valuable in drug delivery systems, where it can be used to create targeted therapies by conjugating drugs to carriers like antibodies or nanoparticles. Additionally, it is employed in the development of diagnostic tools, where it helps in labeling biomolecules for imaging or detection purposes. Its polyethylene glycol (PEG) chain enhances solubility and stability, making it suitable for use in aqueous environments, such as in vivo applications. Overall, it plays a critical role in advancing research and applications in medicine, biotechnology, and materials science.