N-(Azido-PEG4)-N-Boc-PEG4-NHS ester is a PEG-based PROTAC linker with a terminal azide group. N-(Azido-PEG4)-N-Boc-PEG4-NHS ester is used in the synthesis of PROTACs[1]
[1]. Kanazaki K, et al. Feasibility of poly(ethylene glycol) derivatives as diagnostic drug carriers for tumor imaging. J Control Release. 2016 Mar 28;226:115-23.
















