(3R)-3-(N-{1-[N-((1S)-2-{(2S)-2-[N-((1S)-2-Oxo-3-oxo-1-propylpropyl)carbamoyl]pyrrolidinyl}-1-(methylethyl)-2-oxoethyl)carbamoyl](1S,2S)-2-methylbutyl}carbamoyl)-3-[(2S)-2-(acetylamino)-3-carboxypropanoylamino]propanoic acid AIDS-105123 AIDS105123 Ac-D-d-I-V-P-Nva-CHO