Lenalidomide-propargyl-C2-amido-Ph-NH2 hydrochloride incorporates a cereblon (CRBN) ligand for the E3 ubiquitin ligase and a linker. Lenalidomide-propargyl-C2-amido-Ph-NH2 hydrochloride can be used to design the PROTAC MD-224 (HY-114312)[1]. Lenalidomide-propargyl-C2-amido-Ph-NH2 (hydrochloride) is a click chemistry reagent, it contains an Alkyne group and can undergo copper-catalyzed azide-alkyne cycloaddition (CuAAc) with molecules containing Azide groups.