Structure elucidation and NMR assignments of a new sesquiterpene of volatile oil from Willd.

A new sesquiterpene, artefrigin (), together with four known sesquiterpenes were isolated from the volatile oil of Willd. The structure of was elucidated by spectroscopic methods, including UV, IR, HR-ESI-MS and extensive 1D and 2D NMR techniques.