1-[(2-{2-[3-(2,6-Dimethyl-cyclohexyl)-ureido]-3,3-dimethyl-butyrylamino}-5,5-dimethyl-4-oxo-hexanoylamino)-(1-ethyl-2,2-dimethyl-propylcarbamoyl)-methyl]-cyclopentanecarboxylic acid AIDS-191719 AIDS191719