(3R,3aS,6aR or 3S,3aR,6aS)-Hexahydrofuro [2,3-b] furan-3-yl N-((1S,2R)-1-benzyl-2-hydroxy-3-4-[(isopropoxycarbonyl) amino]-,2,2-dimethylbutyl [(4-methoxyphenyl) sulfonyl] aminopropyl) carbamate AIDS-095502 AIDS095502