Thalidomide-NH-C6-NH-Boc is a synthesized E3 ligase ligand-linker conjugate containing the cereblon ligand derived from Thalidomide and a linker utilized in the synthesis of MI-389 (compound 22). MI-389 is a highly effective phthalimide PROTAC degrader developed from the multi-targeted receptor tyrosine kinase inhibitor sunitinib.