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From the  Lasianthus bidoupensis  stems, two new compounds, including one new 9,10-anthraquinone, lasibidoupin A ( 1 ), and one new 6,7-benzocoumarin, lasibidoupin B ( 2 ), together with one known compound, 11- O -methyldamnacanthol ( 3 ) were isolated using chromatographic method. Their structures were determined by extensive HRMS, and NMR assignments. Compound  3  was reported for the first time from this species. New compounds ( 1  &amp;  2 ) were tested for the cytotoxicity against three human cancer cell lines (MCF-7, HeLa, and NCI-H460) by SRB assay. As results,  1  &amp;  2  exhibited significant cytotoxic activity against all cancer cell lines (IC 50  ranged from 0.058   ± 0.003 to 0.177 ± 0.014 μM).

Lasibidoupins A and B, two new compounds from the stems of Lasianthus bidoupensis V.S. Dang & Naiki