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Pyrrolizidine and tetrahydroisoquinoline alkaloids from Echium humile

✍ Scribed by A. El-Shazly; T. Sarg; A. Ateya; E. Abdel Aziz; S. El-Dahmy; L. Witte; M. Wink

Book ID: 103342278
Publisher: Elsevier Science
Year: 1996
Tongue: English
Weight: 450 KB
Volume: 42
Category: Article
ISSN: 0031-9422
DOI: 10.1016/0031-9422(95)00847-0

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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