N-{(2S)-2-[(Morpholin-4-ylacetyl)aMino]-4-phenylbutanoyl}-L-leucyl-N-{(2S)-4-Methyl-1-[(2R)-2-Methyloxiran-2-yl]-1-oxopentan-2-yl}-L-phenylalaninaMide;CarfilzoMib salt;CarfilzoMib/PR 171;PR 171;PR-171 (CarfilzoMib);(alphaS)-alpha-[(4-Morpholinylacetyl)amino]benzenebutanoyl-L-leucyl-N-[(1S)-3-methyl-1-[[(2R)-2-methyloxiranyl]carbonyl]butyl]-L-phenylalaninamide;Carfilzomib;Carfilzomib API and intermediates