(2S,3S)-3-Amino-4-phenyl-1-((E)-1-(4-(pyridin-2-yl)benzyl)-2-(4-(pyridin-2-yl)benzylidene)hydrazinyl)butan-2-ol is an impurity of Atazanavir (A790051), a novel azapeptide HIV protease inhibitor (PI). Antiviral. Molecular Formula: C34H33N5O Molecular Weight: 527.66