1-[[5-[3-(2,6-Dimethyl-cyclohexyl)-ureido]-2-(3,3-dimethyl-2-oxo-butyl)-6,6-dimethyl-4-oxo-heptanoylamino]-(2,2-dimethyl-propylcarbamoyl)-methyl]-cyclopentanecarboxylic acid AIDS-191721 AIDS191721