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C07D251/02—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings
C07D251/12—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members
C07D251/26—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members with only hetero atoms directly attached to ring carbon atoms
C07D251/40—Nitrogen atoms
C07D251/54—Three nitrogen atoms
C07D251/56—Preparation of melamine
C07D251/60—Preparation of melamine from urea or from carbon dioxide and ammonia
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Organic Chemistry
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Organic Low-Molecular-Weight Compounds And Preparation Thereof
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