(3R,3aS,6aR)-Hexahydrofuro[2,3-b]furan-3-yl {(1S,2R)-1-benzyl-3-[[(1-benzyl-2-methyl-1H-benzimidazol-6-yl)sulfonyl](isobutyl)amino]-2-hydroxypropyl}carbamate AIDS-223658 AIDS223658