Bis-PEG7-acid and bis-PEG6-propionic acid are chemical compounds that serve as linkers in the synthesis of PROTACs and antibody-drug conjugates (ADCs), respectively. Bis-PEG7-acid is a PEG-based PROTAC linker, while bis-PEG6-propionic acid is a cleavable ADC linker[1].

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.