目的 研究鄂尔多斯半日花Helianthemum ordosicum树枝的化学成分。方法 采用各种色谱法对鄂尔多斯半日花氯仿提取物进行分离，运用波谱法鉴定分离所得化合物的结构。结果 从鄂尔多斯半日花氯仿提取物中分离得到12个化合物，分别鉴定为β-谷甾醇（1）、stigmast-4-en-3-one（2）、阿魏酸丁酯（3）、苯甲酸二丁酯（4）、苯甲酸（5）、咖啡酸（6）、阿魏酸（7）、表儿茶素（8）、儿茶素（9）、表没食子儿茶素（10）、没食子儿茶素（11）和没食子儿茶素-（4α，8）-表没食子儿茶素（12）。结论 化合物1～12均为该植物中首次分离得到，其中化合物2、8～12为该属植物中首次分离得到。

Objective To study the chemical constituents of CHCl₃ extract from Helianthemum ordosicum. Methods The chemical constituents of CHCl₃ extract from H. ordosicum were isolated and purified by kinds of chromatography. Their structures were identified by spectral methods. Results Twelve compounds, namely β-sitosterol (1), stigmast-4-en-3-one (2), ferulic acid butyl ester (3), benzoic acid dibutyl ester (4), benzoic acid (5), coffee acid (6), ferulic acid (7), epicatechin (8), catechin (9), gallocatechin (10), epigallocatechin (11), and gallocatechin-(4α, 8)-epigallocatechin (12), were obtained and identified from the CHCl₃ extract. Conclusion Compounds 1—12 are isolated from this plant for the first time, of which compounds 2 and 8—12 are isolated from genus Helianthemum Mill. for the first time.