1-((2S,3S)-2-Hydroxy-4-phenyl-3-{[N2-(pyridin-2-ylcarbonyl)-L-asparaginyl]amino}butanoyl)-L-prolyl-L-alloisoleucyl-L-valinamide- AIDS-163644 AIDS163644 Pyridine-CO-Asn-(2S, 3S)-AHPBA-Pro-Ile-Val-NH2