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From the methanolic extract from the roots of T. quadrangularis we isolated 14 alkaloids (1-14) and deduced their structures. All the alkaloids are of the ibogamine-type or im-mediately related to it; (20R)-20-hydroxyibogamine (5) was found for the first time as a natural product.

zeitschrift für naturforschung b

Alkaloide in Tabernaemontana-Arten, XI [1]. Untersuchung der Alkaloide von Tabernaemontana quadrangularis — (20R)-20-Hydroxyibogamin, ein neues Alkaloid aus T. quadrangularis / Alkaloids in Tabernaemontana Species, XI [1]. Investigation of the Alkaloids from Tabernaemontana quadrangularis — (20R)-20-Hydroxyibogamine, a New Alkaloid from T. quadrangularis