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The title compound, C20H25NO4, the product formed in the Amadori rearrangement of L-rhamnose with di­benzyl­amine, is shown by X-ray crystallographic analysis to be a rare example of an Amadori product crystallizing in a furan­ose form.

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The ring size of both the lactone and the ketal protecting group in the title compound, C9H14O5, have been established by X-ray crystallographic analysis. The crystal structure consists of hydrogen-bonded spirals parallel to the b axis.
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