Abstract
Sixteen ceanothane-type triterpenoids, including four new compounds-hovendulcisic acids A-D (1-4) -were purified from the stems of Hovenia dulcis Thunb. The structures of 1-4 were confirmed by comprehensive means including ECD and quantum chemical calculations. Putative biosynthetic pathways of 1-16 were proposed, and 3, 5, and 15 exhibited antitumor activity on A549 and MDA-MB-231 cells.
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