NH2-PEG2-C2-Boc is a polyethylene glycol (PEG)-based PROTAC linker utilized for synthesizing PROTACs[1]. It serves as a non-cleavable 2-unit PEG linker for antibody-drug conjugates (ADCs) in their synthesis[2].

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[1]. ADCs are comprised of an antibody to which is attached an ADC cytotoxin through an ADC linker[2].