Studies on the constituents of Scutellaria species. XIII. On the flavonoid constituents of the root of Scutellaria rivularis Wall.

Four new flavonoids (I-VI) were isolated from the root of Scutellaria rivularis WALL, together with 7-O-β-D-glucuronopyranosides of baicalein, wogonin, carthamidin and isocarthamidin. The structures of I-IV were shown to be 7-hydroxy-5, 8-dimethoxyflavone 7-O-β-D-glucuronopyranoside, 5, 7, 8, 2'-tetrahydroxyflavone 7-O-β-D-glucuronopyranoside, 5, 2'-dihydroxy-7, 8, 6'-trimethoxyflavone 2'-O-β-D-glucuronopyranoside and 5, 2', 6'-trihydroxy-7, 8-dimethoxyflavone 2'-O-β-D-glucuronopyranocide, respectively, on the basis of the chemical and spectral data.

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