From the leaves of Lonicera implexa Aiton (Caprifoliaceae) 22 compounds (five iridoids, one saponin, one cyclitol, three quinic acid derivatives, and 12 flavonoids) were isolated and characterized. Three flavonoids, namely implexaflavone ( 1 ), madreselvin A ( 2 ), and madreselvin B ( 3 ), were new compounds. The structures were determined by spectroscopic methods, including 2D NMR. Some chemotaxonomic and ecological notes about the isolated compounds are given.
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Flamini et al. (1997) studied this question.
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