How many isoprene units are found in tetraterpenes?

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Isoprenoid Camphor, an isoprenoid compound classified as a terpenoid ketone, is used in incense and certain medicinal compounds. It is a natural substance obtained from the camphor laurel (*Cinnamomum camphora*), a species of evergreen.

Tetraterpenes contain eight isoprene units.1

These compounds, which have the molecular formula $C_{40} H_{64}$ , are classified as isoprenoids based on the number of five-carbon isoprene units they contain. While smaller terpenes are defined by fewer units—such as monoterpenes (two units) and sesquiterpenes (three units)—the tetraterpenes are characterized by their eight-unit structure. The most well-known examples of this class are the carotenoid pigments.231