N-Fmoc-N'- (azido-PEG4) -L-Lysine-PFP ester

N-Fmoc-N'- (azido-PEG4) -L-Lysine-PFP ester is an alkyl/ether and PEG-based PROTAC linker that can be used in the synthesis of PROTACs[1]. N-Fmoc-N'- (azido-PEG4) -L-Lysine-PFP ester is a click chemistry reagent, it contains an Azide group and can undergo copper-catalyzed azide-alkyne cycloaddition reaction (CuAAc) with molecules containing Alkyne groups. It can also undergo strain-promoted alkyne-azide cycloaddition (SPAAC) reactions with molecules containing DBCO or BCN groups.