((3S)Oxolan-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-059659 AIDS059659 [3-(S)-(Tetrahydrofuranyl)oxy]carbonyl-(2S,3S)-AHPBA-4(S)-Cl-Pro-NH-t-Bu