Minor Humulane and Eremophilane Sesquiterpenoids from Syringa pinnatifolia and Their Protective Effect Against Oxidative Injuries in H9c2 Cells

As a part of systematic research, an ongoing phytochemical investigation of the sesquiterpenoid-containing fraction led to the isolation of five new sesquiterpenoids from the peeled stems of Syringa pinnatifolia, including two pairs of enantiomeric humulane-type (±)-alashanoids A