English: The symmetric trioxo tautomer of cyameluric acid, namelu 1,4,7-trihydro-2,5,8-trioxo-s-heptazine. This is the most stable tautomer, according to Alkorta, Jagerovic, and Elguero (2004). See also File:Cyameluric acid trioxo 136H form.png.
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