Thalidomide-O-amido-C4-N3 (Standard) is the analytical standard of Thalidomide-O-amido-C4-N3 (HY-103615). This product is intended for research and analytical applications. Thalidomide-O-amido-C4-N3 is a synthesized E3 ligase ligand-linker conjugate that incorporates the Thalidomide based cereblon ligand and a linker used in PROTAC technology. Thalidomide-O-amido-C4-N3 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.