Bis-PEG8-acid, a PEG-based PROTAC linker, is utilized in the synthesis of PROTACs and antibody-drug conjugates (ADCs)[1]. It serves as a cleavable ADC linker, facilitating the development of specialized compounds.

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. ADCs are comprised of an antibody to which is attached an ADC cytotoxin through an ADC linker.