Thalidomide-NH-C4-NH2 TFA (compound 29c) is a conjugate composed of an E3 ligase ligand-linker that integrates a Thalidomide-based cereblon ligand and a linker moiety. This compound is used as a component in PROTAC BRD2/BRD4 degrader-1, a highly potent and selective degrader targeting BET proteins BRD4 and BRD2[1].