Pyridine is a colorless, flammable liquid with a distinct, unpleasant smell. It is a basic organic compound that contains a six-membered ring of five carbon atoms and one nitrogen atom. Pyridine is commonly used as a solvent and in the production of various chemicals, including pyridine derivatives that are important in pharmaceuticals and agrochemicals. This compound is found in many natural sources, such as tobacco smoke and certain foods. Pyridine's structure allows it to participate in various chemical reactions, making it a valuable building block in organic chemistry. Its unique properties also make it useful in the synthesis of vitamins and dyes.