(S)-N-{(1S,4S)-1-Benzyl-3,3-difluoro-4-[(R)-3-methyl-2-(3-pyridin-2-yl-propanoylamino)-butanoylamino]-2-oxo-5-phenyl-pentyl}-3-methyl-2-(3-pyridin-2-yl-propanoylamino)-butyramide AIDS-043385 AIDS043385 Bis(Val-NH)-diF-acetone deriv.