(3R,3aS,6aR)-Hexahydrofuro[2,3-b]furan-3-yl {(1S,2R)-1-benzyl-3-[({1-[2-(dimethylamino)ethyl]-1H-benzimidazol-5-yl}sulfonyl)(isobutyl)amino]-2-hydroxypropyl}carbamate AIDS-223714 AIDS223714