Bortezomib Impurity 21

Chemical Name: 1,1,1-trimethyl-N-((R)-2-methyl-1-((3aS,4S,6S,7aR)-3a,5,5-trimethylhexahydro-4,6-methanobenzo[d][1,3,2]dioxaborol-2-yl)propyl)-N-(trimethylsilyl)silanamine

Synonym: 4-Amino-N-[(1-ethyl-2-pyrrolidinyl)methyl]-5-(ethylsulfonyl)-2-methoxybenzamide; Aminosultopride;