THREE NEW 8, 9-SECO-ENT-KAURANE DITERPENOIDS FROM RABDOSIA SHIKOKIANA (LABIATAE)

Abstract

Three new ent-kauranoids, O-methylshikoccin (3), epoxyshikoccin (4) and O-methylepoxyshikoccin (5), have been isolated from aerial parts of the Rabdosia plant and their structures, including absolute configuration, have been elucidated by the spectroscopic data and the chemical transformations from shikoccin (1).