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The absolute configuration has been determined for the bicyclic title compound, C14H17N7O7S, an inter­mediate in the synthesis of fixed chiral bis­(1,2-amino­hydr­oxy) compounds. In the crystal structure, the chair conformation of the seven-membered lactam ring exhibits four axial heteroatom substituents. The fused five-membered thia­zolidine ring prevents inversion of the seven-membered iduronic acid ring derivative to the thermodynamically more favourable chair conformation with four equatorial substitutions.

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The absolute configuration has been determined for the title compound, C21H27NO9S2·C7H8. The compound is a precurser in the synthesis of bicyclic dipeptide isosteres based on mannuronic acid. The seven-membered lactam ring adopts a rigid chair conformation.
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