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diazine
Diazine refers to a group of organic compounds having the molecular formula C4H4N2. Each contains a benzene ring in which two of the C-H fragments have been replaced by isolobal nitrogen. There are three isomers: * pyrazine (1,4-diazine) image:pyrazine simple structure.svg * pyrimidine (1,3-diazine) image:Pyrimidin.svg * pyridazine (1,2-diazine) image:pyridazine simple structure.svg ==See also==
* 6-membered rings with one nitrogen atom: pyridine * 6-membered rings with three nitrogen atoms: triazines * 6-membered rings with four nitrogen atoms: tetrazines * 6-membered rings with six nitrogen atoms: hexazines
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