Eugenol is a major component of:

Eugenol (${\text{C}}_{10}{\text{H}}_{12}{\text{O}}_2$) is an aromatic, volatile phenolic compound that forms the major component of clove essential oil, accounting for roughly $70\%$ to $90\%$ of its composition. It gives cloves their characteristic aroma and is widely used for its local anesthetic and antiseptic properties in dentistry.