VH032 -C4-NH-Boc is a Boc-modified VH032 that acts as a ligand for VHL to recruit von Hippel-Lindau (VHL) proteins. VH032 -C4-NH-Boc will remove the protecting group under acidic conditions and be directly used in PROTAC molecule synthesis. VH032 -C4-NH-Boc is a key intermediate in the synthesis of PROTAC based on VHL ligand.