Carfilzomib Impurity B

Chemical Name: (S)-N-((R)-1-(((2R,4R)-1,2-dihydroxy-2,6-dimethyl-3-oxoheptan-4-yl)amino)-1-oxo-3-phenylpropan-2-yl)-4-methyl-2-((S)-2-(2-morpholinoacetamido)-4-phenylbutanamido)pentanamide

Smile: O=C(N[C@@H](CC(C)C)C(N[C@H](CC1=CC=CC=C1)C(N[C@H](CC(C)C)C([C@@](O)(C)CO)=O)=O)=O)[C@H](CCC2=CC=CC=C2)NC(CN3CCOCC3)=O