(3S,4S)-tert-butyl 4-(N,N-dibenzylamino)-3-hydroxy-5-phenylpentanoate

(2R,3R,4S,5S)-6-((tert-Butyldimethylsilyl)oxy)-2-(dibenzylamino)-4,5-(isopropylidenedioxy)-3-(methoxymethoxy)hexanal