Functionalized von-Hippel-Lindau (VHL) protein ligand for PROTAC research and development; incorporates an E3 ligase ligand plus a PEG1 linker with terminal carboxylic acid ready for conjugation to a target protein ligand. Part of a range of functionalized tool molecules for PROTAC R&D. PROTAC is a registered trademark of Arvinas Operations, Inc., and is used under license.