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Pyrrolizidine alkaloids from Lithospermum erythrorhizon

✍ Scribed by E. Roeder; B. Rengel

Publisher: Elsevier Science
Year: 1990
Tongue: English
Weight: 230 KB
Volume: 29
Category: Article
ISSN: 0031-9422
DOI: 10.1016/0031-9422(90)85153-7

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## Abstract Three new pyrrolizidine alkaloids, leptanthine (**2**), its corresponding __N__‐oxide **1**, and __N__‐oxide of 3′‐__O__‐acetylechihumiline (**3**), were isolated from the aerial parts of __Onosma leptantha__, together with two known alkaloids of the same type, echihumiline (**5**) and