Seventeen alkaloids have been isolated from the bark of Guatteria schom burgkiana. Two of them are new in this species and are interesting biogenetically: belemine (17) and dehydroguattescine (15). The other alkaloids are known: four tetrahydroprotoberberines, six aporphines, three oxoaporphines, and two 7-methylaporphines. © 1985, American Chemical Society. Alle Rechte vorbehalten.