Minor diterpenoid constituents of Andrographis paniculata Nees

Three diterpenoids closely related to andrographolide have been isolated from Andrographis paniculata Nees. These have been identified as 14-deoxy-11-oxoandrographolide (6), 14-deoxy-11,12-didehydroandrographolide (23), and 14-deoxyandrographolide (26).