1-[[5-[3-(2,6-Dimethyl-cyclohexyl)-ureido]-6,6-dimethyl-4-oxo-2-(2-oxo-2-pyrrolidin-1-yl-ethyl)-heptanoylamino]-(1-ethyl-2,2-dimethyl-propylcarbamoyl)-methyl]-cyclopentanecarboxylic acid AIDS-191718 AIDS191718