前文曾报道从槲寄生中分离及确定五个新黄酮甙的结构。本文报道另一新黄酮化合物(Ⅳ)的分离和结构测定。槲寄生(Viscum coloratura(Kom)Nakai)生药的乙醇提取物,分别用石油醚、醋酸乙酯和正丁醇萃取,正丁醇萃取物经聚酰胺细粉和硅胶低压柱层析,分离得到Ⅳ。通过光谱分析和水解试验,确定Ⅳ的结构为鼠李秦素-3-0-β-D-(6″-β-羟基-β-甲基戊二酸半酯)-葡 Previously, it has been reported that the structure of five new flavone glycosides was isolated and identified from the mistletoe. This article reports the isolation and structure determination of another neoflavone compound (IV). The ethanol extract of Viscum coloratura (Kom) Nakai crude drug was extracted with petroleum ether, ethyl acetate and n-butanol, respectively, and the n-butanol extract was purified by chromatography on a polyamide powder and silica gel to give IV. Through spectroscopic analysis and hydrolysis tests, the structure of IV was determined to be rhamnocin-3-O-β-D-(6′′-β-hydroxy-β-methylglutarate half ester)-Portuguese