(2S)-N-[3-((1S)-1-{(2S)-3-Methyl-2-[(phenylmethoxy)carbonylamino]butanoylamino}-2-phenylethyl)(1S,2R,3R)-2,4-dihydroxy-1-benzylbutyl]-3-methyl-2-[(phenylmethoxy)carbonylamino]butanamide AIDS-113256 AIDS113256