Toosendanin,an insecticidal component was isolated from the fruits of Melia azadarach Linn by the ethanol extraction and the direct crystallization method.

• 报道了有机溶剂提取法提取苦楝果实中的天然杀虫活性成分,并采用结晶法从浓缩液中成功地分离出苦楝素晶体。