Diazine

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Diazine refers to a group of organic compounds having the molecular formula C₄H₄N₂. Each contains a benzene ring in which two of the carbon atoms have been replaced by nitrogen. There are three isomers:

• pyrazine (1,4-diazine)
• pyrimidine (1,3-diazine)
• pyridazine (1,2-diazine)