Two new diarylheptanoids, renealtins A (1) and B (2), have been isolated from the seeds of the Brazilian medicinal plant Renealmia exaltata ("Pacová-catinga", Zingiberaceae), and their structures were elucidated by spectroscopic data. Renealtins A (1) and B (2) are the first example of naturally occurring diarylheptanoids containing a tetrahydrofuran ring.
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Sekiguchi et al. (2002) studied this question.