(-)-beta-elemene, (-)-elema-1,3,11(13)-trien-12-ol, (-)-elema-1,3,11(13)-trien-12-al, and elema-1,3,11(13)-trien-12-oic acid respectively, in addition to small amounts of their diastereomers. Acid induced cyclisation of the germacrenes yields selinene, costol, costal, and costic acid respectively. It is highly probable that the elemenes reported in literature for costus root oil are artefacts.
从新鲜木香根 (Saussurea lappa) 中分离出四种以前被证明是
倍半萜内酯
生物合成中间体的胚芽烯。(+)-germacrene A,germacra-1(10),4,11(13)-trien-12-ol,germacra-1(10),4,11(13)-trien-12-al的结构,和germacra-1(10),4,11(13)-trien-12-oic acid 是通过光谱数据和
化学转化的组合推导出来的。这些化合物的加热产生 (-)-
β-榄香烯、(-)-elema-1,3,11(13)-trien-12-ol, (-)-elema-1,3,11(13)-trien -12-al 和 elema-1,3,11(13)-trien-12-oic 酸,以及少量的非对映异构体。
锗烯的酸诱导环化分别产生
硒烯、木香醇、肋骨和木香酸。很有可能文献中报道的木香油的
榄香烯是人工制品。