An E-ring γ-lactone pentacyclic triterpene from Myrianthus serratus

A novel γ-lactone triterpenoid has been isolated from the methylated ethyl acetate extract of the trunk wood of Myrianthus serratus, as well as friedelin and four known pentacyclic triterpenoid acids, all as their methyl esters. Their structures were elucidated by 2D NMR experiments.