(4R)-4-{N-[(1S)-1-(N-{(1S)-1-[N-((1S){N-[(1S)-1-Ethyl-4-(4-methoxyphenyl)-2-oxobutyl]carbamoyl}cyclohexylmethyl)carbamoyl]-2-methylbutyl}carbamoyl)-3-methylbutyl]carbamoyl}-4-[(2S)-2-(acetylamino)-3-carboxypropanoylamino]butanoic acid AIDS-169908 AIDS169908