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Two new alkaloids, taberdines L ( 1 ) and M ( 2 ), together with six known alkaloids, were isolated from the twigs and leaves of  Tabernaemontana divaricata . Taberdine L ( 1 ) represents the first optically active natural member of the  allo  iboga class of alkaloids with the ethyl side chain in a bridgehead position. Their structures including absolute configuration were elucidated by a combination of MS, NMR, and ECD calculation. The in vitro cytotoxic activities of  1  and  2  against five human cancer cell lines were also evaluated.

Taberdines L and M, two new alkaloids from Tabernaemontana divaricata