carfilzomib Diastereomer Impurity

Chemical Name: (S)-4-Methyl-N-((R)-1-(((S)-4-methyl-1-((R)-2-methyloxiran-2-yl)-1-oxopentan-2-yl)amino)-1-oxo-3-phenylpropan-2-yl)-2-((S)-2-(2-morpholinoacetamido)-4-phenylbutanamido)pentanamide

Smile: CC(C)C[C@H](NC([C@@H](NC(CN1CCOCC1)=O)CCC2=CC=CC=C2)=O)C(N[C@H](CC3=CC=CC=C3)C(N[C@@H](CC(C)C)C([C@]4(C)OC4)=O)=O)=O