(2R,3R,4R,5R)-N'-[(1S)-1-(N-Cyclopropylcarbamoyl)-2-methylpropyl]-2,5-bis(phenylmethoxy)-N-[1-(N-cyclopropylcarbamoyl)-2-methylpropyl]-3,4-dihydroxyhexane-1,6-diamide AIDS-170862 AIDS170862