1982年作者等从甘肃黄芩中分得一新的黄酮甙元,初步认为其结构为5,2′,4′—三羟基-6,8-二甲氧基黄酮,定名甘肃黄芩素Ⅰ(rehderianin Ⅰ)。最近我们合成了该结构的样品(熔点249～250℃),其板层析Rf值与甘肃黄芩素Ⅰ不一致。此外还合成了若干类似结构的化合物,其中只有5,2′,5′-三羟基-7,8-二甲氧基黄酮(熔点265℃)与甘肃黄芩素Ⅰ经三个溶剂系统的同层离,具有相同的Rf值。因此我们比较了这两个样品在加入五种不 In 1982, the authors obtained a new flavonoid glycoside from the scutellaria baicalensis Gansu, and preliminarily assumed that its structure was 5,2′,4′-trihydroxy-6,8-dimethoxyflavone, and its name was Gansu scutellarin I (rehderianin). I). Recently, we synthesized a sample of this structure (melting point 249 ~ 250 °C), its plate chromatographic Rf value and Gansusu I inconsistent. In addition, a number of compounds of similar structure have been synthesized, of which only 5,2′,5′-trihydroxy-7,8-dimethoxyflavone (melting point 265° C.) is in the same layer as the three solvent systems of Gansu Saponin I. Off, with the same Rf value. So we compared the two samples in the five