(2S,3R,4S,5R,6S)‐6‐Benzyl­oxy­methyl‐4‐(methoxy­methyloxy)‐9‐oxo‐8‐oxa‐1‐aza­bi­cyclo­[4.3.0]­nonane‐2,3,5‐triyl tri­acetate

The relative configuration of the title compound, C₂₃H₂₉NO₁₁, prepared in a synthetic study on the natural product sphingofungin E, has been determined. The six‐membered ring adopts a chair form and the five substituents are all axial.