Carfilzomib, A next generation proteasome inhibitor, Synonyms: (S)-4-methyl-N-((S)-1-((S)-4-methyl-1-((R)-2-methyloxiran-2-yl)-1-oxopentan-2-ylamino)-1-oxo-3-phenylpropan-2-yl)-2-((S)-2-(2-morpholinoacetamido)-4-phenylbutanamido)pentanamide; PR-171, CAS: 868540-17-4, 5 mg, 25 mg