Objective To study the chemical constituents and biological activities of Ligularia mongolica roots. Methods The compounds were isolated and purified from the extracts of Ligularia mongolica roots by using the column chromatography and the structures of these compounds were identified by spectroscopic analysis including proton nuclear magnetic resonance( 1H-NMR),carbon nuclear magnetic resonance(13C-NMR) and mass spectrometry( MS). The antitumor activity of the compounds was evaluated by 3-( 4,5-dimethyl-2-...