<![CDATA[Dysoxylum alliaceum belongs to the Dysoxylum genus (Meliaceae) and there are few reports concerning the phytochemical components of this plant. To examine the chemical constituents of Dysoxylum alliaceum stem bark, a phytochemical study has been conducted and identified five known steroids, 3β,16β-dihydroxy-24(S)-methyl cholestenol (1), ergosta-5,22-dien-3β-ol (2), ergosta-7,24(28)-dien-3β-ol (3), 22(E)-ergosta-6,22-dien-3β,5α,8α-triol (4), and 20α-dihydroprogesterone (5) from its ethanolic extract. Spectroscopic data such as FT-IR, HR-ESI-MS, 1D, and 2D NMR as well as comparison with previously published spectral data were used to identify the chemical structures of compounds 1–5. Furthermore, these steroids 1-5 were assessed in vitro regarding their cytotoxic effect against A549 lung cancer cell lines and revealed weak to inactive with IC50 values ranging from 68.52 to >150 µM. Keywords: A549 cell lines, cytotoxic evaluation, Dysoxylum alliaceum (blume) blume ex a.juss, meliaceae, steroid]]>
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