Abstract: From the roots of Rubia yunnanensis, two new arborane type triterpenoids, rubiarbonone B and C were isolated and their structures were elucidated as 7β, 19α, 28 - trhydroxyarbor - 9 (11) - en - 3 - one and 28 - acetoxyl - 7β, 19α - dihydroxyarbor -9(11) - en - 3 - one respectively by spectral and chemi-cal methods.

Key words: Rubia yunnanensis

摘要： 从小红参（Rubia yunnanensis）中分离鉴定了 2个新的乔木烷型二萜，分别命名为茜草乔木酮乙和丙（rubiarbonone B，C）。用光谱和化学方法证明它们的结构分别为：7β，19α，28-三羟基乔木-9（11）-烯-3-酮和28-乙酚氧基-7β，19α-二羟基乔木-9（11）-烯-3-酮。

关键词: 小红参, 茜草乔木酮乙, 茜草乔木酮丙