首次从鸢尾科鸢尾属植物白花射干(Iris dichotoma Pall.)根茎中分离出七个黄酮类化合物。根据理化常数及光谱数据,证明成分Ⅰ为一新异黄酮5,3′-dihvdroxy-4′,5′-dimetheoxy-6,7-methylene-dioxyisoflavone,命名为自射干素(dichotomitin),成分Ⅱ为次野鸢尾黄素(irisflorentin),成分Ⅲ为汉黄芩素(wogonin),成分Ⅳ为鼠李秦素(rhamnazin),成分Ⅴ为野鸢尾甙元(irigenin),成分Ⅵ为鸢尾甙元(tectorigenin),,成分Ⅶ为鸢尾甙(tectoridin)。 For the first time, seven flavonoids were isolated from the roots of Iris dichotoma Pall. According to the physicochemical constants and spectral data, component I was identified as a novel isoflavone 5,3′-dihvdroxy-4′,5′-dimetheoxy-6,7-methylene-dioxyisoflavone, named as dichotomitin, and component II as In the case of irisflorentin, component III is wogonin, component IV is rhamnazin, component V is irigenin, and component VI is tectorigenin, Component VII is tectoridin.