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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.