Biological Source
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Alkaloid from Chrysophyllum lacourtianum, Nocardia sp. and Streptomyces sp., also present in tobacco smoke, Catharanthus roseus leaves, Lolium perenne and Festuca arundinacea
(Sapotaceae, Apocynaceae, Gramineae).
A metab. from the New Zealand ascidian Ritterella sigillinoides
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