摘要:
Twenty compounds including three new dammarane glycosides, named betalnoside A (7), betalnoside B (8), and betalnoside C (11) were isolated from Betula alnoides Buch. -Ham. ex D. Don (Betulaceae), of which 13 (1-13) were from the leaves, seven (14-20) from the stem bark, and three (2, 16, and 17) from the twigs. Their structures were determined using spectroscopic analyses. (C) 2011 Phytochemical Society of Europe. Published by Elsevier B.V. All rights reserved.