Fmoc-N-amido-PEG2-azide is a PROTAC linker belonging to the PEG category, used in the synthesis of PROTAC molecules. This compound is a click chemistry reagent containing an azide group, enabling copper-catalyzed azide-alkyne cycloaddition reactions (CuAAC) with molecules that include an alkyne group. Additionally, it can undergo strain-promoted azide-alkyne cycloaddition (SPAAC) with molecules containing DBCO or BCN groups.