(1S,2S)-2-benzoylamino-1-(4-nitro-phenyl)-propane-1,3-diol

(1RS,2RS)-2-benzoylamino-3-benzoyloxy-1-methoxy-1-phenyl-propane

N-[2-(4-nitro-phenyl)-2-oxo-1-trityloxymethyl-ethyl]-acetamide