HIV PROTEASE INHIBITOR;AC-LEU-VAL-L-PHENYLALANINAL;AC-LEU-VAL-PHE-ALDEHYDE;AC-LEU-VAL-PHENYLALANINAL;N-Acetyl-Leu-Val-Phe-al;(S)-2-acetamido-4-methyl-N-((S)-3-methyl-1-oxo-1-((S)-1-oxo-3-phenylpropan-2-ylamino)butan-2-yl)pentanamide;REF DUPL: N-Acetyl-Leu-Val-Phe-al;N-acetyl-leucinyl-valinyl-phenylalaninal