Azido-PEG10-azide is a PROTAC linker belonging to the PEG category, utilized in the synthesis of PROTAC molecules. As a click chemistry reagent, it features azide groups capable of participating in copper-catalyzed azide-alkyne cycloaddition reactions (CuAAc) with alkyne-containing molecules. Additionally, it engages in strain-promoted azide-alkyne cycloaddition reactions (SPAAC) with DBCO or BCN-containing molecules.