(S,R,S)-AHPC-PEG2-NH2 dihydrochloride(Cat No.:I015587)is a bifunctional chemical building block used in PROTAC (proteolysis-targeting chimera) research. The AHPC moiety binds the von Hippel–Lindau (VHL) E3 ubiquitin ligase, enabling targeted protein degradation, while the PEG2 linker provides flexibility and solubility for conjugation to a ligand of interest. The terminal amine group allows further functionalization in synthetic chemistry. Supplied as a dihydrochloride salt, it ensures stability and handling convenience. This compound is widely applied in medicinal chemistry and chemical biology for designing novel degraders to explore therapeutic protein knockdown strategies.