A New Diterpenoide from Isodon lophanthoides var. Gerardianus

A new diterpenoid, 11,12-dihydroxyabieta-7-oxo-8,11,13-trien-15-ol, along with two known diterpenoids were isolated from the roots of Isodon lophanthoides var. gerardianus. The structures of the three compounds were elucidated by spectroscopic methods and literatures.