Abstract
The mass spectra of the methyl ester of
the new unsaturated pentacyclic triterpenoid ifflaionic acid
(urs-12-en-3-on-30-oic acid) and some of its chemical derivatives are
presented. These may be used to assign position C-20 to the carbomethoxy and C-3
or C-7 to the keto group. Mechanistic proposals for, and the effect of
functional groups on, the main fragmentation of the molecular ions (cleavage
through ring C) are discussed.
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