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Three new anthraquinones, 1-desmethylchryso-obtusin (4), 1-desmethylobtusin (5) and 1-desmethylaurantio-obtusin (6), were isolated along with chrysophanol-10, 10'-bianthrone, questin and benzoic acid from the seeds of Cassia obtusifolia LINN., and their structures were established on the basis of spectral and chemical evidence.
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Kitanaka et al. (1984) studied this question.
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