Bioactivity guided separation of Walsura trichostemon stem methanolic extract led to the isolation of four new dammarane (1–4) and two new apotirucallane triterpenoids (5–6), together with one limonoid (7), 11,25-dideacetyltrichostemonate, 12β, 20S, 24R-trihydroxydammar-25-en-3-one and 12β, 20S, 25-trihydroxydammar-23-en-3-one. Compounds 1–7 showed in vitro inhibitory activity on the proliferation of A549, human lung adenocarcinoma cell line.

中文翻译：

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Walsura trichostemon的三萜

生物活性引导的分离割舌树属trichostemon干导致的四个新的达玛烷（隔离甲醇提取物1 - 4）和两个新的三萜类化合物apotirucallane（5 - 6与一个柠檬苦素（一起）7），11,25-dideacetyltrichostemonate，12β，20 S，24 R-三羟基达玛-25-en-3-one和12β，20 S，25-三羟基达玛-23-en-3-one。化合物1 – 7对人肺腺癌细胞系A549的增殖具有体外抑制活性。