Pyridine

One of the most simple heteroaromatic molecules, with the Hill system formula C₅H₅N.

Pyridine is structurally similar to benzene, with a single nitrogen atom substituting in the six-member aromatic ring for one of the carbon and one of the hydrogen atoms.

Pyridine is a base. It's [conjugate acid]? is a unipositive complex ion called pyridinium?, C₅H₅NH⁺.

Under conditions of standard temperature and pressure, pyridine is a liquid with a strong odor.