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The xanthone constituents were examined in four kinds of the Nepalese species of Swertia (Gentianaceae), i.e., S. racemosa, S.nervosa, S.gracilescens, and S.dilatata. Norswertianin (I), swertianin (II), methylswertianin (III), gentiacaulein (IV), decussatin (V), desmethylbellidifolin (VI), bellidifolin (VII), and methylbellidifolin (VIII) were isolated and identified, together with oleanolic acid. Distribution of these xanthones are listed.
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Tomimori et al. (1974) studied this question.
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