(3R,3aS,6aR or 3aR,6aS) Hexahydrofuro [2,3-b] furan-3-yl, N-((1S,2R)-1-benzyl-2-hydroxy-3-5-[(isopropoxycarbonyl) amino]-2,2-dimethylpentyl [(4-methoxyphenyl) sulfonuyl] aminopropyl) carbamate AIDS-095503 AIDS095503