2-tert-Butoxycarbonylamino-3-methyl-butyric acid, (1S,3R)-3-benzyl-1-((S)-2-tert-butylcarbamoyl-4-pyridin-3-ylmethyl-piperazin-1-ylmethyl)-4-((3aS,8aR)-2,2-dimethyl-8,8a-dihydro-3aH-indeno[1,2-d]oxazol-3-yl)-4-oxo-butyl ester AIDS-093734 AIDS093734