(3R,3aS,6aR)-Hexahydrofuro[2,3-b]furan-3-yl {(1S,2R)-1-benzyl-2-hydroxy-3-[isobutyl({1-(2-phenylethyl)-2-[(2-pyrrolidin-1-ylethyl)amino]-1H-benzimidazol-6-yl}sulfonyl)amino]propyl}carbamate AIDS-223694 AIDS223694