New prenylated flavones, artoindonesianins Z-4 and Z-5, together with four known prenylated flavones, artonin E, 12-hydroxyartonin E, artobiloxanthone, and cycloartobiloxanthone, have been isolated from the methanol extract of the tree bark of Artocarpus lanceifolius. The structures of these compounds were determined on the basis of spectroscopic data, including UV, IR, 1D and 2D NMR, and mass spectra. The cytotoxic effect of the isolated compounds against murine leukemia P-388 cells is described.
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