Explanatory notes
… such as 1,4,4a,5,6,7,8,8a-octahydro- exo -1,4- endo -5,8-dimethanonaphthalene (C 12 H 16 ) from which the pesticide … heading 32.04 . (B) CYCLOTERPENES These hydrocarbons do not differ in general chemical structure from the cyclene group … oil, etc. (3) Limonene* , found in citrus fruit oils; dipentene , being the mixed optical isomers of limonene. …