Benzyl-PEG6-azide is a PROTAC linker classified under the PEG category, used in the synthesis of PROTAC molecules. It serves as a click chemistry reagent, containing an azide group that can participate in copper-catalyzed azide-alkyne cycloaddition reactions (CuAAC) with alkyne-containing molecules. Furthermore, it engages in strain-promoted azide-alkyne cycloaddition reactions (SPAAC) with molecules containing DBCO or BCN groups.