Millipedes (Diplopoda) are well known for their toxic or repellent defensive secretions. As part of a larger investigation, we describe the chemical constituents of 14 species of Tasmanian millipedes in seven genera. Six species in the genus Gasterogramma were found to produce acyclic ketones, including the pungent unsaturated ketones 1, 2, and 6, and the novel (rel-3R,5S,7S)-3,5,7-trimethyl-2,8-decanedione (7b), for which the stereoconfiguration was established by stereoselective syntheses of pairs of isomers. These compounds have not been detected before in millipede defensive secretions. This report is the first on species of the suborder Dalodesmidea (Polydesmida), a dominant component of the soil and litter fauna of the temperate regions of the Southern Hemisphere.

中文翻译：

---

塔斯马尼亚（Diplopoda，Polydesmida）的某些达洛德斯米德千足虫的化学

千足虫（Diplopoda）以其有毒或驱蚊的防御性分泌物而闻名。作为较大调查的一部分，我们描述了七个属的14种塔斯马尼亚千足虫的化学成分。六种属中的Gasterogramma被发现产生无环酮，包括刺激性不饱和酮1，2，和6，和小说（相对-3 - [R，5小号，7小号）-3,5,7-三甲基-2- ，8-癸二酮（7b），其立体构型是通过异构体对的立体选择性合成而建立的。在千足虫的防御性分泌物中尚未检测到这些化合物。该报告是第一个关于达洛德斯米德亚（Polydesmida）亚种的报告，该亚目是南半球温带地区土壤和垃圾动物区系的主要组成部分。