VH032-OH is the VH032-based VHL ligand. VH032-OH can be connected to the ligand for protein by a linker to form PROTACs.In Vitro: PROTACs contain two different ligands connected by a linker; one is a ligand for an E3 ubiquitin ligase and the other is for the target protein. PROTACs exploit the intracellular ubiquitin-proteasome system to selectively degrade target proteins.