Cytotoxic limonoids from the root bark of Dictamnus angustifolius

Three novel limonoids, dictangustone G (1), dictangustone H (2), and dictangustone I (3) were isolated from the root bark of Dictamnus angustifolius. Their structures were elucidated on the basis of detailed spectroscopic analysis including UV, IR, HRESIMS, 1D and 2D NMR spectroscopic experiments. Compounds 1–3 were evaluated for their cytotoxic activities using Hela, A549, MCF7, and LN229 cell lines.