The new 3′,6,8-trichloro-4′,5-dihydroxy-7-methoxyisoflavone (1) and 3′,5′, 6,8-tetrachloro-4′,5-dihydroxy-7-methoxyisoflavone (2) have been isolated from the wood of Ouratea semiserrate Mart. (Engl.). Their structures were established from spectroscopic data, including 2D NMR experimetns and mass spectra.
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Velandia et al. (1998) studied this question.
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