摘要：

The absolute structure of (+)-13β-hydroxymamanine (1), isolated from an alkaloidal component of Maackia amurensis (Leguminosae), has been established as (7R, 9S, 11R, 13R) by the X-ray analysis of its hydrobromide. The absolute stereochemistry of 1 is the same as that of the structure corresponding to an oxidative product derived from (-)-baptifoline (7R, 9R, 11R, 13R) coexisting in the same plant. It was strongly suggested that 1 might be an oxidative metabolite of (-)-baptifoline.

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