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Pyrrolizidine alkaloids from Cryptantha species

✍ Scribed by Frank R. Stermitz; Michael A. Pass; Ronald B. Kelley; J. Richard Liddell

Publisher: Elsevier Science
Year: 1993
Tongue: English
Weight: 638 KB
Volume: 33
Category: Article
ISSN: 0031-9422
DOI: 10.1016/0031-9422(93)85524-u

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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

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