STRUCTURE OF ALNUSERIC ACID, THE FIRST REPORTED NATURALLY OCCURRING C31-SECODAMMARANE-TYPE TRITERPENE FROM ALNUS SERRULATOIDES CALL.

Abstract
A novel C31-3,4-secodammarane-type triterpene, alnuseric acid, was isolated from the male flowers of Alnus serrulatoides Call. (Betulaceae). Its structure was elucidated to be (20S,24R)-20 ,24-epoxy-24-methyl-3,4-secodammar-4(28)-en-3-oic acid (I) by a combination of chemical and spectroscopic methods.

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