noun. 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.

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

"Yet the more than 500 amino acids that make up the chemical factories in each-known as sesquiterpene synthases-are nearly identical to each other, with very minor differences accumulated over approximately several million years of evolutionary change."

sesquiterpenoid  terpene  

hydrocarbon  terpene  

aristolochene  artemisinin  cadalene  cadinene  caryophyllene  

Seneca  acid.33  aliphatic  allylic  amyl