Carfilzomib N-Oxide Impurity

Chemical Name: 4-((4S,7S,10S,13S)-10-Benzyl-7-isobutyl-15-methyl-13-((R)-2-methyloxirane-2-carbonyl)-2,5,8,11-tetraoxo-4-phenethyl-3,6,9,12-tetraazahexadecyl)morpholine 4-oxide

Smile: CC(C)C[C@@H](C([C@]1(C)OC1)=O)NC([C@H](CC2=CC=CC=C2)NC([C@H](CC(C)C)NC([C@H](CCC3=CC=CC=C3)NC(C[N+]4([O-])CCOCC4)=O)=O)=O)=O