(3R,3aS,6aR)-hexahydrofuro[2,3-b]furan-3-yl {(1S,2R)-1-benzyl-2-hydroxy-3-[isobutyl({1-[(1-methyl-1H-imidazol-5-yl)methyl]-1H-benzimidazol-6-yl}sulfonyl)amino]propyl}carbamate AIDS-223705 AIDS223705