[Structure of rubescensin E].

Rubescensin E(I), a new diterpenoid, was isolated from the leaves of Rabdosia rubescens collcted in Jiyuan county, Henan Province On the basis of spectroscopic evidences, the structure of rubescensin E lished as ent-7 beta, 20-epoxy-7 alpha, 14 alpha-dihydroxy-6 alpha, 15 alpha-diacetoxy-16kaurene.