How many isoprene units are found in diterpenes?

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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.

Diterpenes are composed of four isoprene units.12

These compounds, which have the molecular formula $C_{20} H_{32}$ , are classified as isoprenoids and are often found in the essential oils of plants, such as in the form of rosin acids. Another notable example of a diterpene is vitamin A.12