Some examples are tomentonone, zeyloxanthonone and calozeyloxanthone isolated from the bark of " Calophyllum tomentosum ", apetalinone A, E, morellic acid and forbesione from " Garcinia gaudichaudii ", methylswertianin and bellidifolin from " Swertia punicea " or psorospermin obtained from " Psorospermum febrifugum ".
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