AIDS-056933 AIDS056933 Cbz-(MeSO2Val)Phe Epoxy deriv. [(R)-1-((S)-1-{(2R,3S)-3-[2-(tert-Butyl-ethyl-sulfamoyl)-ethyl]-oxiranyl}-2-phenyl-ethylcarbamoyl)-2-methanesulfonyl-2-methyl-propyl]-carbamic acid benzyl ester