(4R)-4-{N-[(1S)-1-(N-{(1S)-2-[(2S,4R)-2-(N-{2-Oxo-2-[N-benzylcarbamoyl]-1-propylethyl}carbamoyl)-4-(phenylmethoxy)pyrrolidinyl]-1-(methylethyl)-2-oxoethyl}carbamoyl)-2-methylbutyl]carbamoyl}-4-[(2S)-2-(acetylamino)-3-carboxypropanoylamino]butanoic acid AIDS-162020 AIDS162020