Colouring Matters of Australian Plants. IX. 2-methylanthraquinone from Morinda Species
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Whole roots of Morinda citrifolia yielded nordamnacanthal (1.7%), morindone (0.5%), rubiadin, and rubiadin-1-methyl ether as the principal pigments. 

Damnacanthol was isolated as a new derivative, which is probably an artifact, and another minor component is believed to be soranjidiol (1,6-dihydroxy-2-methyl2-methylanthraquinone). Rubiadin and rubiadin-1-methyl ether have also been isolated from a small sample of the root bark of M. jasminoides.

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