(3R,3aS,6aR)-Hexahydrofuro[2,3-b]furan-3-yl {(1S,2R)-1-benzyl-2-hydroxy-3-[{[1-(2-hydroxyethyl)-1H-benzimidazol-6-yl]sulfonyl}(isobutyl)amino]propyl}carbamate AIDS-223698 AIDS223698