Tetraterpenes are terpenes consisting of eight isoprene units and have the molecular formula C40H64. Tetraterpenoids (carotenoids) are tetraterpenes that have been modified by chemical transformations such as oxidation or cyclization.
Biologically important tetraterpenoids include:
- Carotenes and carotenoids, such as the acyclic lycopene, the monocyclic γ-carotene, and the bicyclic α- and β-carotenes
- Xanthophylls, pigments distributed widely in nature
- Tetraterpenes, TheFreeDictionary
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