N-[(1S,2S)-2-Hydroxy-1-(phenylmethyl)-3-[1-[[4-(2-pyridinyl)phenyl]methyl]hydrazinyl]propyl]carbamic Acid 1,1-Dimethylethyl Ester is an intermediate used in the synthesis of Atazanavir-d9 (A790053), which is the deuterated analog of Atazanavir (A790051), a azapeptide HIV protease inhibitor derivative. Atazanavir have been investigated as potential treatment of human immunodeficiency virus (HIV) and for anticancer purposes.