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Some of the anthraquinone derivatives isolated from Rubia cordifolia. Purpurin (1), pseudopurpurin (2), xanthopurpurin (3), alizarin (4), munjistin (5), lucidin (6), lucidin primeveroside (7), lucidin-Ω-ethyl-ether (8), nordamnacanthal (9), pachybasin (10), quinzarin (11), rubiadin (12), ruberythric acid (13), tectoquinone (14), anthragallol (15), danthron (16), anthrafalvin (17), alizarin-2-methyl-ether (18) (structures of metabolites were drawn by authors).
