(R)-2-Acetylamino-N-((S)-1-{(2R,3S)-3-[((S)-1-benzyl-2-methyl-propylcarbamoyl)-methyl]-oxiranyl}-2-phenyl-ethyl)-3-methanesulfonyl-3-methyl-butyramide AIDS-045193 AIDS045193 Ac(MeSO2Val)Phe Epoxy deriv.