Extraction and Isolation. An ethanol extract of the air- dried roots of M. dauricum (20 kg) was treated with 2% tartaric acid solution. The tartaric acid soluble portion was basified with aqueous ammonia and extracted with chloroform and butanol, respectively, to give a chloroform residue (35 g) and butanol residue (40 g). The chloroform residue was subjected to Si gel chromatography by elution with CHCl3- MeOH (20:1-1:1) and gave 20 fractions. Fraction 5 (200 mg) was further purified by Si gel column chromatography eluted with hexane-acetone (10:1) to afford 25 fractions. Fraction 5 was purified by Si gel column chromatography eluted with hexane-acetone (20:1) and yielded compound 1 (20 mg). Fraction 7 was purified by Si gel column chromatography