Thalidomide-5-NH-PEG2-NH2 hydrochloride is a Thalidomide (HY-14658)-based cereblon ligand that recruits CRBN proteins. Thalidomide-5-NH-PEG2-NH2 hydrochloride can be connected to the target protein ligand through a linker to form a PROTAC molecule. For example, THAL-SNS-032 (HY-123937).