(3R,3aS,6aR)-Hexahydrofuro[2,3-b]furan-3-yl {(1S,2R)-1-benzyl-2-hydroxy-3-[isobutyl({2-[(methoxycarbonyl)amino]-1H-benzimidazol-5-yl}sulfonyl)amino]propyl}carbamate AIDS-223664 AIDS223664