Abstract
The phytochemical investigation of the bark of Zizyphus xylopyra resulted in the isolation of two new 14-membered ring cyclopeptide alkaloids, xylopyrine-G and xylopyrine H. Their structures have been established by chemical and spectral evidences.
Acknowledgements
The authors thank Prof G. Rücker, ex-Director, Pharmazentisches Institut der Universität Bonn, Germany for the spectral analysis.