Abstract: A new ent-kaurene diterpene, rabdoforrestin A (1 ) , mp 204- 206°C, [α]22/D -83°(c=0.96,CHCL3)was isolated from the leaves of Rabdosia forrestii (Diels) Hara (Labiatae) collected Lijiang, Yunnan. Its structure has been shown to be ent-11β-hydroxy-2α, 3α,6β, 7α-tetraacetoxy-16-kauren-15-one (1 ) on the basis of spwctroscopic and chemical evidence and compared with known compound lushanrubescensin B .

Key words: Rabdosia forrestii

摘要： 从紫萼香茶菜叶的已醚提取物中分得一个新的二萜化合物,命名为紫萼香茶菜甲素(rabdoforrestin A），根据波谱和化学证据，其结构为对映-11β-羟基-2α,3α,6β,7α-四已酰氧基-16-贝壳杉烯-15-酮（ent-11β-hydroxy-2a,3a,6β,7a-tetraacetoxy-16-kauren-15-one).另外还分离到已知黄酮化合物线蓟素(cirsiliol 4).

关键词: 紫萼香茶菜, 对映- 贝壳杉烷型二萜化合物, 紫萼香茶菜甲素, 黄酮化合物, 线蓟素, 1H NMR, 13C NMR