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.
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