terpenes plants isoprene units diterpenes sesquiterpenes terpenoids derivatives monoterpenes essential oils IPP isoprene natural products camphor molecules CH3 compounds carbon molecular formula turpentine mixture pinene resin liquid carotenoids Triterpenes alcoholic menthol Chemistry hydrocarbons carbon atoms building block constituents organic chemistry oxygen C5H8 Monoterpenes Terpenes Search CH2 prefix aroma pathway triterpenes sesterterpenes precursor plant Chemistry Dictionary IUPAC nomenclature Mono biosynthesis plant growth substances gibberellin abscisic acid solvent Unanswered questions Product Information Diterpenes Terpenoids essential oil Hemiterpenes Sesquiterpenes flavor molecule nose Foundations varnish Glyco 1R Isoprene garden carotene compound the action building blocks conifer polymerization coatings Figure 1 Encyclopedia sesquiterpene diosgenin taxol side chain in vivo progesterone alkaloids wormwood carbons steroids head-to-tail precursors New World Encyclopedia agent boils CH2 CH2 chief sources chain fractional distillation extraction generic name general formula distinct groups Biochemistry free encyclopedia unsaturated hydrocarbons CDCl3 sterols isomers rubber alcohols aldehydes sodium dipentene terpineol sulphuric acid yields Chem alcohol citral hemiterpenes ketones isoprene rule characteristic odour oil monoterpene