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CCDC 785898 [(-)- 3ca ], CCDC 785897 (rac- 8fb) and CCDC 808987 [(-)- 8ce ] contain the crystallographic data in this paper. These data can be obtained free of charge from The Cambridge Crystallographic Data Centre via. The absolute structures of other dihydropyranones 3 and 8 were assigned by comparison of the optical rotation and CD spectra with those of (-)- 3ca and (-)- 8ce.
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