Bortezomib Impurity B

Chemical Name: N-((S)-1-(((R)-3-mhyl-1-((3aR,5S,7R,7aS)-6,6,7a-trimethyltetrahydro-5H-5,7-methano[1,3,2]dioxaborolo[4,5-b]pyran-2-yl)butyl)amino)-1-oxo-3-phenylpropan-2-yl)pyrazine-2-carboxamide

Smile: O=C(N[C@@H](CC1=CC=CC=C1)C(N[C@@H](CC(C)C)B2O[C@H](O[C@@H]3C(C)(C)[C@H]4C3)[C@@]4(C)O2)=O)C5=NC=CN=C5