Leishmanicidal activity of 46 natural products including several fern and Betula constituents was examined. Several pterosin and atisene compounds from ferns had high activity. Among the triterpenoids the carboxyl group was found to be important for activity. In the diarylheptanoids, the linear-type and the diphenylether-type showed significant activity, and it was found that the carbonyl group at C-11 is necessary for the activity of biphenyl-types.
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Takahashi et al. (2004) studied this question.
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