Classification of Terpenes Carbon atoms I Isoprene units Classification 10 Monoterpenes 15 Sesquiterpenes 20 25 30 234568 Diterpenes Sesterterpenes Triterpenes 40 TetraterpenesClassification of Terpenes Carbon atoms Isoprene units Classification 10 2 Monoterpenes 15 3 Sesquiterpenes 20 4 Diterpenes 25 5 Sesterterpenes 30 6 Triterpenes 40 8 Tetraterpenes