Two new ent-kauranoids, tenuifolin A (3beta,6alpha, 15beta-trihydroxy-1alpha, 7beta-diacetoxy-11beta, 16beta-epoxy-ent-kaurane) (1) and tenuifolin B (1alpha,6alpha, 11beta-trihydroxy-3beta,7beta-diacetoxy-ent-kaur-16-en-15-one) (2), together with four known compounds were isolated from the aerial parts of Isodon tenuifolia (W. W. Smith) Kudo collected from Zhongdian County, Yunnan Province, China. Their structures were determined by the spectral methods (including 2D NMR techniques).
A new lignan, together with a known one, was isolated from Isodon lophanthoides var. gerardianus [Bentham] H. Hara. The structure of the new lignan was elucidated as 1_acetoxyl_2e_piperonyl_6e_[6_methoxyl_piperonyl]_3,7_dioxabicyclo_[3,3,0]_octane mainly by 1D and 2D NMR techniques.
