Riccardin A and riccardin B, two novel cyclic bis(bibenzyls) possessing cytotoxicity from the liverwort Riccardia multifida (L.) S. Gray

The Journal of Organic Chemistry
1983.0

Abstract

Riccardin A (1) and Riccardin B (4a), two novel cyclic bis(bibenzyls) possessing cytotoxic activity, were isolated from the liverwort Riccardia multifida (L.) S. Gray together with 6-(3-methyl-2-butenyl)indole (9). Proof for the proposed structure and definite evidence for the stereochemistry of 1 were provided by X-ray analysis of the acetate of 1. The structure of 4a was suggested by the analysis of 400-MHz ¹H NMR spectral data.

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