A new flavonoid, 2,5-dihydroxy-6,7-dimethoxyflavanone (1), was isolated from the leaf and stem exudates of Collinsonia canadensis along with three known flavones, baicalein-6,7-dimethyl ether (2), norwogenin-7,8-dimethyl ether (3), and tectochrysin (5-hydroxy-7-methoxyflavone).
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Stevens et al. (1999) studied this question.
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