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From the plants of the genus I odon (Labiatae), many deterpenoids having ent-kaurene, 7,20-epoxyent-kaurene, 6,7-seco-ent-kaurene, 8,9seco-ent-kaurene, 6-epient-gibberelene, ent-isopimanthrene and abietene skeletons have been isolated and characterized. 1 These substances have shown various biological activities such as antibacterial, anitumor and cytotoxic effects 2-3 etc. In a previous study of the chemical constituents of Isodon, we reported on the isolation of two new ent-kaurene diterpenoids, taibairubescensins A and B. 4 During the course of our systematic search for biologically active substances from plants of the genus Isodon, recently, we examined diterpenoid constituents of Isodon Japonica (Burm. f.) Hara (Labiatae) collected from Taibai Mountain, China, and isolated a new diterpenoid, named taibaijaponicain E ( 1), along with four known compounds, norhendosin A ( 2), nodosin ( 3), rabdophyllin G (4), lasiodin (5). We report here the isolation and structure elucidation of new compound by a combination of NMR techniques, including DEPT, HMBC and NOESY.

A New Diterpenoid Isolated from Isodon japonica Structure Elucidation by NMR Spectroscopy