Benzyl-PEG24-azide is a PROTAC linker within the PEG category, used for synthesizing PROTAC molecules. As a click chemistry reagent, it features an azide group that participates in copper-catalyzed azide-alkyne cycloaddition reactions (CuAAc) with alkyne-containing molecules. Additionally, it engages in strain-promoted azide-alkyne cycloaddition reactions (SPAAC) with molecules having DBCO or BCN groups.