(3R,3aS,6aR or 3S,3aR,6aS)-Hexahydrofuro [2,3-b] furan-3-yl N-((1S,2R)-1-benzyl-3-[5-(dimethylamino)-2,2-dimethylpentyl][(4-methoxyphenyl) sulfonyl] amino-2-hydroxyproopyl) carbamate AIDS-095499 AIDS095499