The Structure of Alnuserrutriol, a New C31 Dammarane-type Triterpenoid from the Male Flowers of Alnus serrulatoides

Abstract The structure of a new C31 dammarane-type triterpenoid, alnuserrutriol, isolated from the male flowers of Alnus serrulatoides CAll. (Betulaceae) has been elucidated to be (3S,12R, 20S)-3,12,20-trihydroxy-24-methylenedammarane by a combination of chemical and spectroscopic methods.