Pyridine is an organic compound, chemical formula C5H5N, which is a six membered Heterocyclic compound containing a nitrogen heteroatom. It can be seen as a compound in benzene molecules where one (CH) is replaced by N, hence also known as nitrobenzene. It is a colorless or slightly yellow liquid with a foul odor. Pyridine and its homologues exist in bone tar, Coal tar, gas, Shale oil and petroleum. Pyridine can be used as a denaturant, dyeing aid, and raw material for synthesizing a series of products (including pharmaceuticals, disinfectants, dyes, etc.) in industry.