Ent-kaurene diterpenoids, isodopharicins A, B and C in Isodon pharicus - Wang,Z.M.; Cheng,P.Y.; Min,Z.D.; Zheng,Q.T.; Wu,C.Y.; Xu,M.J.; Gue,Y.W.; Mizuno,M.; Iinuma,M.; Tanaka,T. (Phytochemistry, 1991)