Pyridine
Pyridine is a heterocyclic organic compound with the chemical formula C5H5N. It is a colorless and highly flammable liquid with a distinct, unpleasant odor. Pyridine is used as a solvent, catalyst, and precursor to various pharmaceuticals, agrochemicals, and dyes. It is also found in tobacco smoke and is known to have toxic effects on human health. Pyridine has a basic nature due to the lone pair of electrons on the nitrogen atom, which makes it a weak base. Its derivatives, such as pyridoxine (vitamin B6), are essential for many biological processes in the human body.