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Acutifolin A (1), a novel constituent with a bicyclo[3.3.1]non-3-ene-2,9-dione ring, acutifolins B-F (2-6), five new flavans, and three known flavans were isolated from the bark of Brosimum acutifolium, a Brazilian folk medicine ("Mururé"). Their structures were elucidated by spectroscopic methods, including 2D NMR.
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Takashima et al. (2001) studied this question.
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