Rumex alpinus

Chrysophanol (XXIII), an anthraquinone isolated from the leaves of Rumex alpinus (Polygonaceae), is also formed from acetate (and presumably therefore derived via the acetate-malonate pathway) (Leistner and Zenk, 1969) and not, as previously considered, from shikimic acid and mevalonate. Only anthraquinones such as alizarin lacking a C-methyl group and not hy-droxylated in ring A are made in this way, despite an apparent similarity in structure thus at least two independent routes also exist for the synthesis of these compounds and reflect the diversity available for the biogenesis of multiringed phenols in plants. 

The occurrence of 2-acetylorcinol and its monoglucoside was established in Tissue Cultures from Rumex alpinus (Polygonaceae) [2715],... 

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