Quinoline is a heterocyclic aromatic organic compound with the chemical formula C9H7N. It is a heterocyclic analogue of naphthalene that can be obtained by fusing a benzene ring to a pyridine nucleus. Quinoline and its derivatives have various medicinal uses, including as antimalarials, amebicides, treatments for infections caused by bacteria such as pneumonia and gonorrhea, and as a chemotherapeutic agent for treating leukemia.