1-((2S,3S)-3-{[3-(Aminosulfonyl)-N-(tert-butoxycarbonyl)-L-alanyl]amino}-2-hydroxy-4-phenylbutanoyl)-N-(tert-butyl)-L-prolinamide AIDS-163688 AIDS163688 Boc-Sma-(2S, 3S)-AHPBA-Pro-NH-tBu