(3R,3aS,6aR or 3S,3aR,6aS) Hexahydrofuro [2,3-b] furan-3-yl N-((1S,2R)-3-(5-azido-2,2-dimethylpentyl)[(4-methoxyphenyl) sulfonyl] amino-1- benzyl-2-hydroxypropyl) carbamate AIDS-095471 AIDS095471