Abstract: Five flavonodis were isolated from the stem of Desmos chinensis Lour., of wich three were identified as desmethoxymatteucinol(II),negletein(III) and lawinal(IV) respectively.The structure of new dihydroflavone named cochinine A,was elucidated as 5-hydroxy-6-fromyl-7-methoxy-8-methyl dihydrflavone (I) by means of spectroscopic analysis.The chemotaxonomy feature of these flavonoids was also approached.

Key words: Annonaceae, Desmos ckinensis

摘要： 从假鹰爪(Desmos chinensis Lour.)茎皮乙醇提取物的非生物碱部分得到5个黄酮类成分，其中1个为新的双氢黄酮，命名为假鹰爪素A(cochinine A)，经波谱分析，其结构测定为5-羟基-6-甲酰基-7-甲氧基-8-甲基双氢黄酮(I)。同时，还鉴定了其中的desmethoxymatteucinol(II),negletein(III)及lawinal(IV)。此外，还探讨了该类黄酮成分在化学分类上的意义。

关键词: 蕃荔枝科, 假鹰爪, 假鹰爪素A, 化学分类