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从印楝(Azadirachta indica)种仁的提取物中分离得到10仆四降三萜化合物,能过波谱方法鉴定,它们分别是nimbin(1),deacetylnimbin(2),salannolide(3),azadirachtin(4),vepaol(5),isovepaol(6),3-tigloyl-azadirachtol(7),1-tigloyl-3-acetyl-azadirachtinin(8),3-tigloy-azadirachtinin(9),1-tigloy1-3-acetyl-11-hy