Dammarane triterpenoids from Dysoxylum richii

Four new dammarane-type triterpenoids, named methyl richenoate, richenone, richenol and richenoic acid, together with four known triterpenoids, ocotillone, cabraleone, shoreic acid and eichlerianic acid, were isolated from the fruits of Dysoxylum richii. The proposed structures were established by chemical interconversions, spectral analysis and comparisons among closely related compounds.