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The title compound, C59H56ClN3O16, is an important dissacharide precursor to novel therapeutics for the treatment of Alzheimer's disease. It crystallizes with two independent enantio­merically identical mol­ecules in almost exactly the same orientation in the cell, being one half cell-edge apart. Apart from the conformation of a single benzyl group, the mol­ecules are superimposable. They are bound efficiently using complementary C—H...O(carbonyl) hydrogen bonds, principally along the `duplicating' axis. The absolute configurations were determined.
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