1-[(2-{2-[3-(2,6-Dimethyl-cyclohexyl)-ureido]-3,3-dimethyl-butyrylamino}-4-oxo-4-pyrrolidin-1-yl-butyrylamino)-(1-ethyl-2,2-dimethyl-propylcarbamoyl)-methyl]-cyclopentanecarboxylic acid AIDS-191717 AIDS191717