211873-72-2 (S) 211873-73-3 (R) AIDS-000409 AIDS000409 Carbamic acid, [(1S)-2-methyl-1-[[[(1R)-3,3,3-trifluoro-2-oxo-1-(2-phenylethyl)propyl]amino]carbonyl]propyl]-, phenylmethyl ester [(S)-2-Methyl-1-((R)-3,3,3-trifluoro-2-oxo-1-phenethyl-propylcarbamoyl)-propyl]carbamic acid, benzyl ester