New picrotoxane terpenoids from Picrodendron baccatum

Two new picrotoxane norditerpenoid lactones, picrodendrins X () and Y (), and four new picrotoxane sesquiterpenoid lactones, picrodendrins Z (), α (), β () and picrodendrioside A () were isolated from the bark and leaves of Picrodendron baccatum. Their structures were determined by spectral analysis and X-ray crystallographic analysis.