(4R)-4-[N-((1S)-1-{N-[(1S)-1-(N-{(1S)[N-((1S)-1-Ethyl-8-methyl-2-oxononyl)carbamoyl]cyclohexylmethyl}carbamoyl)-2-methylbutyl]carbamoyl}-3-methylbutyl)carbamoyl]-4-[(2S)-2-(acetylamino)-3-carboxypropanoylamino]butanoic acid AIDS-169911 AIDS169911