A rarely reported trinorsesquiterpene-type structure in an isolate from Pulicaria insignis

摘要

A trinorsesquiterpene, 1, and its possible precursor sesquiterpene 2 were obtained from the Tibetan folk medicine Pulicaria insignis (Ming ? chen ? serpo). Their structures were elucidated on the basis of spectral methods including 2D-NMR. The trinorsesquiterpene skeleton of 1 is the second example of this type of structure found in a plant, after a first compound of this type was isolated from bird's nest fungi (Cyanthus bulleri).