Flavonoids in the roots of Euchresta horsfieldii in Thailand

Abstract In addition to known compounds [kushenol E, 6,8-di(3,3-dimethylally)genistein, osajin, warangalone, derrone 4′- O -methyl ether, alpinumisoflavone 4′-methyl ether and feruloyl hexadecayl ester], three new flavonoids were isolated from the roots of Euchresta horsfieldii in Thailand. By means of the spectroscopic analysis, the structures of new compounds were characterized as 5,2′,4′-trihydroxy-6-(3,3-dimethylallyl-6‴,6‴-dimethylpyrano[2‴,3‴: 7,8)] flavanone(euchrenone a 9 ),5, 4′-dihydroxy-6-(3,3-dimethylallyl)-5‴-hydroxyisoproyldihydrofurano [2″,3″: 7,8]isoflavone (euchrenone b 10 )and 2-methoxymaackiain.