Carfilzomib Dimer Impurity 1

Chemical Name: (S)-2-((2S,5S,8S,11S)-5-Benzyl-8-isobutyl-14-morpholino-4,7,10,13-tetraoxo-2,11-diphenethyl-3,6,9,12-tetraazatetradecanamido)-4-methyl-N-((S)-1-(((S)-4-methyl-1-((R )-2-methyloxiran-2-yl)-1-oxopentan-2-yl)amino)-1-oxo-3-phenylpropan-2-yl)pentanamide