Cycloartane-type glycosides from Astragalus schottianus

Three new cycloartane-type triterpene glycosides were isolated from the roots of Astragalus schottianus Boiss. Their structures were established as 20(R),25-epoxy-3-O-ß-d-xylopyranosyl-24-O-ß-d-glucopyranosyl-3ß, 6?,16ß,24?-tetrahydroxycycloartane (1), 20(R),25-epoxy-3-O- [ß-d-glucopyranosyl(1 › 2)]-ß-d-xylopyranosyl-24-O-ß-d- glucopyranosyl-3ß,6?,16ß,24?-tetrahydroxycycloartane (2), 3-O-ß-d-xylopyranosyl-3ß,6?,16ß,20(S),24(S), 25-hexahydroxycycloartane (3) by the extensive use of 1D and 2D-NMR techniques and mass spectrometry. © 2012 Phytochemical Society of Europe. Published by Elsevier B.V. All rights reserved.King Saud UniversityWe wish to thank Dr. Markus Ganzera for his assistance with the HR-MS experiments and Dr. H. Aşkın Akpulat for authentication of the plant species. We also acknowledge partial financial support from the Global Research Network for Medicinal Plants (GRNMP) and King Saud University . Appendix A -