Azido-PEG-PFP ester is a compound that contains multiple functional groups, including an azido group, a polyethylene glycol (PEG) linker, and a pentafluorophenyl (PFP) ester. This molecule has gained significant attention in pharmaceutical research and development due to its ability to selectively react with biological molecules and introduce new functionalities. The azido group is particularly useful in bioconjugation reactions as it can undergo click chemistry with alkynes or cyclooctynes to form stable triazole linkages. Meanwhile, the PEG linker can improve the solubility and biocompatibility of the molecule. Therefore, Azido-PEG-PFP ester is a promising tool for drug delivery, imaging, and other biomedical applications.