(R)-N-((S)-1-{(2R,3S)-3-[(1-Benzyl-2-methyl-propylcarbamoyl)-methyl]-oxiranyl}-2-phenyl-ethyl)-3-methanesulfonyl-3-methyl-2-(3-methyl-butanoylamino)-butyramide AIDS-045219 AIDS045219 i-BuCO(MeSO2-Val)Phe Epoxy deriv.