((3S)(3,6-Dihydro-2H-pyran-3-yloxy))-N-((1S,2S)-3-{(2S,4S)-2-[N-(tert-butyl)carbamoyl]-4-chloropyrrolidinyl}-2-hydroxy-3-oxo-1-benzylpropyl)carboxamide AHPBA deriv. AIDS-059663 AIDS059663 [5(R)-5,6-Dihydro-2H-pyranyl]oxy]carbonyl-(2S,3S)-AHPBA-4(S)-Cl-Pro-NH-t-Bu