CAS 2803420-45-1 is the registry number for (R)-4-methyl-N-((R)-1-(((S)-4-methyl-1-((R)-2-methyloxiran-2-yl)-1-oxopentan-2-yl)amino)-1-oxo-3-phenylpropan-2-yl)-2-((S)-2-(2-morpholinoacetamido)-4-phenylbutanamido)pentanamide, 98%. Offered by: Fluorochem. Available pack sizes: 10mg.