Quinoline is an organic compound with a bicyclic structure, consisting of a benzene ring fused to a pyridine ring. It is a colorless to yellowish liquid with a distinctive odor and is primarily used in the production of dyes, pharmaceuticals, and agrochemicals. Quinoline can be derived from coal tar or synthesized through various chemical reactions. This compound is significant in the field of chemistry due to its role as a building block for more complex molecules. Additionally, derivatives of quinoline, such as chloroquine, are important in medicine, particularly for treating malaria and other diseases.