(4R)-4-(N-{(1S)-1-[N-((1S)-2-{(2S,4R)-2-[N-(Amino-N-butylcarbonylamino)carbamoyl]-4-(phenylmethoxy)pyrrolidinyl}-1-(methylethyl)-2-oxoethyl)carbamoyl]-2-methylbutyl}-N-hydroxycarbamoyl)-4-[(2S)-2-(acetylamino)-3-carboxypropanoylamino]butanoic acid AIDS-162043 AIDS162043