Four Flavonoids in the Roots of Euchresta formosana.

Abstract Four new flavonoids from the roots of Euchresta formosana were characterized as 5,5′-dihydroxy-8-γ,γ-dimethylallyl-{(6″,6″-dimethylpyrano(2″,3″:7,6)}-{(6 ,6 -dimethylpyrano-(2 ,3 :4′,3′)}-coumaronochromone (euchretin D), 5,5′-dihydroxy-6-γ,γ-dimethylallyl-{(6″,6″-dimethylpyrano(2″,3″: 7,8)}-{(6 ,6 -dimethyl-pyrano(2 ,3 :4′,3′)}-coumaronochromone euchretin E), 5,2′-dihydroxy-8-γ,γ-dimethylallyl-{(6″,6″-dimethylpyrano (2″,3″:7,6)}-{(6 ,6 -dimethylpyrano-(2 ,3 :4′,5′)}flavanone euchrenone a 11 and 5,2′-dihydroxy-6-γ,γ-dimethylallyl-{(6″,6″-dimethylpyrano(2′,3″:7,8)}-{6 ,6 -dimethylpyrano(2 ,3 :4′,5′)} flavanone (euchrenone a 12 ) by means of spectroscopic analysis.