首次自蔷薇科水杨梅属植物水杨梅(Geum aleppicum Jacq.)全草中分得一个新化合物—3,4-O,O-次甲基-4′-O-甲基鞣花酸(Ⅰ)和一个新的天然产物—4,4′-O-二甲基鞣花酸(Ⅱ),主要理化数据如下:(Ⅰ)和(Ⅱ)均为淡黄色针晶,热溶于二甲基亚砜和吡啶,难溶于水和一般有机溶剂。有蓝色荧光。遇浓硫酸、氨和氢氧化钠显黄色。FeCl_3/EtOH 反应阳性,(Ⅰ)mp247℃ A new compound, 3,4-O,O-methylene-4’-O-methyl ellagic acid (I), was firstly obtained from the whole plant of the genus of the genus of the genus of the genus of the genus of the genus Geum aleppicum Jacq. And a new natural product, 4,4’-O-dimethyl ellagic acid (II), the main physical and chemical data are as follows: (I) and (II) are pale yellow needles, thermal dissolved in dimethyl Asia Sulfone and pyridine, insoluble in water and general organic solvents. Blue fluorescence. When concentrated sulfuric acid, ammonia and sodium hydroxide appear yellow. Positive FeCl_3/EtOH reaction, (I)mp247°C