Coumaronochromones in the roots of Euchresta japonica

Abstract In addition to eight known compounds [euchrenones a 6 , a 11 and a 12 , glabrol, euchretins AC, and lespedezaflavanone C], three new coumaronochromones were isolated from the roots of Euchresta japonica . By means of spectroscopic analysis, the structures of new compounds were characterized as 5,7,4′,5′-tetrahydroxy-6,8-di(γ,γ-dimethylallyl)-, 5,4′,5′-trihydroxy-6-γ,γ-dimethylallyl-[6″,6″-dimethylpyrano(2″,3″:7,8)]-, and 5,7,5′-trihydroxy-8-γ,γ-dimethylallyl-[6″′,6″′-dimethylpyrano(2″′3,3″′:4′,3′)]-coumaronochromone, and were named euchretins F, G and H, respectively.