Benzyl-PEG13-azide is a PROTAC linker within the PEG category, utilized in the synthesis of PROTAC molecules. This compound acts as a click chemistry reagent, featuring an Azide group that can participate in copper-catalyzed Azide-Alkyne cycloaddition reactions (CuAAC) with molecules containing Alkyne groups. Additionally, it can undergo strain-promoted Azide-Alkyne cycloaddition reactions (SPAAC) with molecules that have DBCO or BCN groups.