(R)-1-(4,4,5,5-Tetramethyl-1,3,2-dioxaborolan-2-yl)pentan-1-amine Hydrochloride is an impurity in the synthesis of Bortezomib(B675700) which is a reversible inhibitor of the 26S proteasome-a barrel-shaped multiprotein particle found in the nucleus and cytosol of all eukaryotic cells. Targets the ubiquitin-proteasome pathway.
