Flavonoids and a coumarin from Gutierrezia sphaerocephala

The ethyl acetate extract of the aerial parts of Gutierrezia sphaerocephala afforded, in addition to one coumarin, 10 known and two new flavonoids. The structures were elucidated by spectroscopic methods. The new, flavonoids are 5,3′,4′,5′-tetrahydroxy-6,7-dimethoxyflavone and 5,7,4′-trihydroxy-6,3′-dimethoxyflavanone.