Carfilzomib Impurity 21

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

Smile: O=C([C@@]1(CO1)C)[C@H]([C@@H](C)CC)NC([C@@H](NC([C@H](CC(C)C)NC([C@@H](NC(CN2CCOCC2)=O)CCC3=CC=CC=C3)=O)=O)CC4=CC=CC=C4)=O