Hydrocarbons or their derivatives formed by the condensation of eight isoprene units (that is, four terpenes) and therefore containing 40 carbon atoms; for example, various carotenoids.
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Terpenoids are classified to hemi-terpenes (C5), monoterpenes (C10), sesquiterpenes (C15), diterpenes (C20), triterpenes (C30), and tetraterpenes (C40) [25].
They occur as di (C20), tri (C30), and tetraterpenes (C40), as well as hemi (C5) and sesquiterpenes (C15).