sesquiterpene

The class name applied, in organic chemistry, to hydrocarbons of the formula C₁₅H₂₄, possessing a closed-chain structure. The term is derived from the fact that the terpenes have the formula C₁₀H₁₆.

Any terpene formed from three isoprene units, and having fifteen carbon atoms; includes several plant pigments such as the flavones.