Thalidomide-NH-(CH2)2-NH-Boc is a Boc-modified Thalidomide (HY-14658) that acts as a Cereblon ligand to recruit CRBN protein. The Boc protecting group at the end of Thalidomide-NH-(CH2)2-NH-Boc can be removed under acidic conditions to participate in the synthesis of PROTAC molecules. Thalidomide-NH-(CH2)2-NH-Boc is a key intermediate in the synthesis of CRBN-based PROTAC molecules.