Biological Source
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Occurs widely in the plant world, for example, the root of Gelsemium sempervirens, Atropa belladonna, Convolvulus scammonia, Ipomoea orizabensis, Prunus serotina, Fabiana imbricata and
also Diospyros spp., Peucedanum spp., Heracleum spp., Skimmia spp.
Also occurs in the Chinese crude drug Toki (from Angelica acutiloba )
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