Carfilzomib Impurity 11 (SRRRR)

Chemical Name: (2R)-4-Methyl-N-[(1R)-1-{[(2S)-4-methyl-1-[(2S)-2-methyloxiran-2-yl]-1-oxopentan-2-yl]carbamoyl}-2-phenylethyl]-2-[(2R)-2-[2-(morpholin-4-yl)acetamido]-4-phenylbutanamido]pentanamide

Smile: O=C([C@@]1(CO1)C)[C@@H](CC(C)C)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