3 2',4',6'-TRIOXYGENATED FLAVANONES IN ROOTS OF ECHINOSOPHORA-KOREENSIS

Further investigation of the phenolic constituents of the roots of Echinosophora koreensis, led to the isolation of 11 compounds. Their structures were determined as (2S)-6-geranyl-5,7,2',4',6'-pentahydroxyflavanone (sophoraflavanone D), (2S)-8-geranyl-5,7,2',4',6'-pentahydroxyflavanone (sophoraflavanone E), (2S)-6,8-di(gamma,gamma-dimethylallyl)-5,7,2',4',6'-pentahydroxyflavanone (kenusanone B), sophoraisoflavanone A, isosophoranone, 2,3-dehydrokievitone, sophoracarpanc B, sophoronol, pratensein, genistein and scopoletin. Three of them are novel flavanones possessing a 2',4',6'-trihydroxyl moiety on the B ring.