Abstract

Cornusiin A (4), a dimeric ellagitannin which forms four anomeric isomers, have been isolated from Cornus officinalis fruits, along with cornusiin B (5) and related compounds. Their structures and the ratio of tautomers in the equilibrium mixture of 4 were determined. Oenothein C (8), which was produced by partial hydrolysis of 5, has been isolated also from Oenothera erythrosepala leaves.

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