6-ethenylquinoline is a structurally unique aromatic heterocyclic compound that is an important intermediate in the production of other aromatic compounds. It has also been used as a starting material for the synthesis of a variety of drugs, including antifungal, antiparasitic and antiviral agents. It has been shown to be an inhibitor of a variety of enzymes involved in drug metabolism, including cytochrome P450, aldehyde oxidase and xanthine oxidase.