目的 研究木棉Bombax malabaricum花的化学成分。方法 通过硅胶和凝胶柱色谱进行化合物的分离与纯化，结合波谱数据和X-ray单晶衍射的方法进行结构解析。结果 从木棉花中分离得到1个新化合物，鉴定为3β-乙酰氧基-22α，30-二羟基熊果-20-烯。结论 化合物1是熊果烷型三萜类化合物，命名为木棉萜A。

Objective To study the chemical constituents from the flowers of Bombax malabaricum. Methods The compound was separated and purified by silica gel and gel column choromatography. The structure of the new compound was identified by NMR, HRMS (EIS), IR, UV, and single crystal X-ray diffraction. Results A new compound was isolated from the flowers of B. malabaricum and identified as 3β-acetoxy-22α,30-dihydroxyurs-20-ene. Conclusion Compound 1 was a ursane-type triterpenoid and named as mumian terpene A.

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国家自然科学基金资助项目（81503224）；广东省科技计划项目（2016A050502052）；广东省教育厅基金项目（2016KZDXM031）；广州市科技计划基金项目（201707010467）