(4R)-4-[N-(1-{N-[1-(N-{1-[N-((1R)-1-Carboxy-2-sulfanylethyl)carbamoyl](1S)-2-cyclohexylethyl}carbamoyl)(1S)-2-methylbutyl]carbamoyl}(1S)-3-methylbutyl)carbamoyl]-4-(3-carboxypropanoylamino)butanoic acid AIDS-170450 AIDS170450