ALNUSERRUDIOLONE, A NEW C31-DAMMARANE-TYPE TRITERPENE FROM ALNUS SERRULATOIDES CALL.

Abstract
The structure of alnuserrudiolone, a new C31-dammarane-type triterpene isolated from the male flowers of Alnus serrulatoides Call. (Betulaceae), has been elucidated to be (20s)-12β,20-dihydroxy-24-methylene-dammaran-3-one (I) by a combination of chemical and spectroscopic methods.