propargyl-peg-4-o-c1-nhs ester

Propargyl-PEG4-O-C1-NHS ester, also known as compound 8, is a polyethylene glycol (PEG)-based linker that serves as a reactive functional group for the synthesis of proteolysis targeting chimeras (PROTACs).

Propargyl-O-C1-amido-PEG4-C2-NHS ester is a non-cleavable 4-unit PEG linker employed in antibody-drug conjugation (ADC) to connect antibodies with drugs.