Abstract
Two new cyclopeptide alkaloids, sativanine-N and sativanine-O were isolated from the stem bark of Zizyphus sativa and their structures were established by spectral analysis.
Acknowledgements
The authors are thankful to Dr G. Eckhardt, Mass Spectroscopic Division, Institut für Organische Chemie und Biochemie, and Prof. G. Rücker, Pharmazeutisches Institut of the University of Bonn, Germany, for spectral analysis.