(S,R,S)-AHPC-PEG2-NH2 hydrochloride (E3 ligase Ligand-Linker Conjugates 6) is a synthesized E3 ligase ligand-linker conjugate. (S,R,S)-AHPC-PEG2-NH2 hydrochloride incorporates the (S,R,S)-AHPC based VHL ligand and 2-unit PEG linker used in the synthesis of PROTAC.