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Examples of pyrrolizidine alkaloids reported for typical phytochemicals found in plants of the genera Eupatorium, Heliotropium, Petasites, Brachyglottis, Cineraria, and Cynoglossum. With the exemption of Lindelofine, all other PAs are unsaturated and have a double bond between C1 and C2. The figure of these chemical structures was obtained from the recent open access publication of Kopp et al. [56].
