Seven undescribed hydroxylated cassane-type furanoditerpenoids were isolated from pupal cases formed from the secretion/excretion of the larvae of the wild bruchid seed beetle Sulcobruchus sauteri in infested Caesalpinia decapetala seeds, and their structures were elucidated by interpreting their spectra. The hydroxylated furanoditerpenoids found in the pupal cases were not present in the seeds of the host plant. Caesalacetal and caesaljapin obtained from the intact seeds exhibited larvicidal activity against the larvae of Aedes albopictus, while the hydroxylated furanoditerpenoids isolated from the pupal cases were inactive. The larvae of S. sauteri are proposed to detoxify larvicidal diterpenoids that occur in the seeds of the host plant by regiospecific hydroxylation.

中文翻译：

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Caesalpinia decapetala 种子内的 bruchid 甲虫 Sulcobruchus sauteri 产生的蛹壳中的羟基化呋喃二萜类化合物

七种未描述的羟基化卡桑型呋喃二萜类化合物是从被感染的 Caesalpinia decapetala 种子中野生 bruchid 种子甲虫 Sulcobruchus sauteri 的幼虫分泌/排泄形成的蛹壳中分离出来的，并通过解释它们的光谱来阐明它们的结构。在蛹壳中发现的羟基化呋喃二萜类化合物不存在于寄主植物的种子中。从完整种子中获得的 Caesalacetal 和 caesaljapin 表现出对白纹伊蚊幼虫的杀幼虫活性，而从蛹壳中分离出的羟基化呋喃二萜类化合物没有活性。建议 S. sauteri 的幼虫通过区域特异性羟基化对宿主植物种子中存在的杀幼虫二萜类化合物进行解毒。