Atazanavir Impurity B

tert-butyl ((R)-1-((S)-oxiran-2-yl)-2-phenylethyl)carbamate

2-(4-(hydrazinylmethyl)phenyl)piperidine

tert-butyl 2-(4-(pyridin-2-yl)benzylidene)hydrazinecarboxylate

tert-butyl 2-(3-((tert-butoxycarbonyl)amino)-2-hydroxy-4-phenylbutyl)-2-(4-(pyridin-2-yl)benzyl)hydrazinecarboxylate

methyl ((S)-1-(2-((2S,3S)-3-((S)-2-amino-3,3-dimethylbutanamido)-2-hydroxy-4-phenylbutyl)-2-(4-(pyridin-2-yl)benzyl)hydrazinyl)-3,3-dimethyl-1-oxobutan-2-yl)carbamate

tert-butyl 2-((2S,3R)-3-((tert-butoxycarbonyl)amino)-2-hydroxy-4-phenylbutyl)-2-(4-(pyridin-2-yl)benzyl)hydrazinecarboxylate

(2R,3R,4R,5S,6R)-5-(((4aR,6R,7R,8R,8aR)-7,8-dihydroxy-2-(4-(pyridin-2-yl)phenyl)hexahydropyrano[3,2-d][1,3]dioxin-6-yl)oxy)-6-(hydroxymethyl)tetrahydro-2H-pyran-2,3,4-triol

methyl ((S)-1-(((2S,3S)-3-hydroxy-1-phenyl-4-(1-(4-(pyridin-2-yl)benzyl)-2-(4-(pyridin-2-yl)benzylidene)hydrazinyl)butan-2-yl)amino)-3,3-dimethyl-1-oxobutan-2-yl)carbamate

tert-butyl 2-((2S,3S)-3-((tert-butoxycarbonyl)amino)-2-hydroxy-4-phenylbutyl)-2-(4-(pyridin-2-yl)benzyl)hydrazinecarboxylate

methyl ((S)-1-(((2S,3S)-3-hydroxy-1-phenyl-4-(1-(4-(pyridin-2-yl)benzyl)-2-(4-(pyridin-2-yl)benzylidene)hydrazinyl)butan-2-yl)amino)-3,3-dimethyl-1-oxobutan-2-yl)carbamate

4-(pyridin-2-yl)benzoic acid

methyl N-[(2S)-1-[2-[(2S,3S)-2-hydroxy-3-[[(2S)-2-(methoxycarbonylamino)-3,3-dimethylbutanoyl]amino]-4-phenylbutyl]-2-[(4-pyridin-2-ylphenyl)methyl]hydrazinyl]-3,3-dimethyl-1-oxobutan-2-yl]carbamate-D6