Two methyl-migrated 16,17-seco-dammarane triterpenoid saponins from the seeds of Hovenia acerba

Two new methyl-migrated 16,17-seco-dammarane triterpenoid saponins, named acerboside A (1) and acerboside B (2), were isolated from the seeds of Hovenia acerba. Their structures were elucidated on the basis of spectroscopic analysis and hydrolysis.