Thalidomide -O-C6-azide is a synthesized E3 ligase ligand-linker conjugate ( E3 Ligase Ligand-Linker Conjugates ) that incorporates the Thalidomide ( Thalidomide ) based cereblon ligand and a linker used in PROTAC technology. Thalidomide -O-C6-azide is a click chemistry reagent, it contains an Azide group and can undergo copper-catalyzed azide-alkyne cycloaddition reaction (CuAAc) with molecules containing Alkyne groups. It can also undergo strain-promoted alkyne-azide cycloaddition (SPAAC) reactions with molecules containing DBCO or BCN groups.