(4S)-4-[N-((1S)-1-Carbamoyl-2-phenylethyl)carbamoyl]-4-{(5S,2R,4S)-5-[(tert-butoxy)carbonylamino]-4-hydroxy-6-phenyl-2-benzylhexanoylamino}butanoic acid AIDS-057807 AIDS057807 Boc-Phe[CH(OH)CH2]Phe-Glu-Phe-NH2