A sulfur-containing compound causes the foul smell of the defensive pygidial gland fluid of Ceroglossus buqueti Laporte and Ceroglossus magellanicus Gehin. This compound was identified as 3-methyl-1-(methylthio)-2-butene by a comparison of its mass spectrum, and chromatographic properties with those of a chemically synthesized standard. Although a few sulfur compounds are known from insect secretions, this sulfur-bearing isoprene derivative has not been characterized previously from any arthropod source. Additional components in the defensive section include acetic, propanoic, isobutyric, butanoic, methacrylic, ethacrylic, tiglic and benzoic acids, and 11-tricosene. Samples prepared from specimens of Ceroglossus chilensis Eschscholtz showed methacrylic, ethacrylic, and other acids. However, 3-methyl-1-(methylthio)-2-butene was not detected in the defensive fluid of C. chilensis.

中文翻译：

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3-甲基-1-（甲硫基）-2-丁烯：两种臭臭科动物臭味防御分泌物中的一种成分（鞘翅目：甲鱼科）

含硫化合物会引起布罗吉拉草和麦哲伦天蛾的防御性腺体液产生恶臭。通过比较其质谱和色谱性质与化学合成标准品的色谱性质，将该化合物鉴定为3-甲基-1-（甲硫基）-2-丁烯。尽管从昆虫的分泌物中知道了一些硫化合物，但是这种含硫异戊二烯衍生物以前从未通过任何节肢动物来源得到表征。防御部分中的其他成分包括乙酸，丙酸，异丁酸，丁酸，甲基丙烯酸，乙基丙烯酸，tiglic和苯甲酸，以及11-三甲苯。从智利白尾蛇标本制备的样品Eschscholtz显示为甲基丙烯酸，乙基丙烯酸和其他酸。但是，在C. chilensis的防御液中未检测到3-甲基-1-（甲硫基）-2-丁烯。