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triazine
A triazine is class of nitrogen-containing heterocycles. The parent molecules' molecular formula is 333. They exist in three isomeric forms: 1,3,5-triazines, being common. == Structure == The triazines have planar six-membered benzene-like ring but with three carbons replaced by nitrogens. The three isomers of triazine are distinguished by the positions of their nitrogen atoms, and are referred to as 1,2,3-triazine, 1,2,4-triazine, and 1,3,5-triazine. Other aromatic nitrogen heterocycles are pyridines with one ring nitrogen atom, diazines with 2 nitrogen atoms in the ring and tetrazines with 4 ring nitrogen atoms.
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