2-((1S)-1-{(2S)-3-Methyl-2-[(phenylmethoxy)carbonylamino]butanoylamino}-2-phenylethyl)-4-{(2S)-3-methyl-2-[(phenylmethoxy)carbonylamino]butanoylamino}(3S,4S,2R)-3-hydroxy-5-phenylpentanoic acid AIDS-113247 AIDS113247