Two new methyl chanofruticosinate-type indole alkaloids, flavisiamines E (1) and F (2), and an aspidofractinine-type indole alkaloid, fruticosiamine A (3), have been isolated from Kopsia flavida and K. fruticosa, respectively and their structures were elucidated by NMR spectral analysis using 2D techniques.
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Morita et al. (2008) studied this question.
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