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Any of a class of organic compounds containing two benzene rings joined to each other by an inner benzene ring in which two of the carbon atoms have been replaced by nitrogen atoms. Phenazines are a type of pyrazine, and are used especially in making dyes and in pharmaceuticals.

The simplest of this class of compounds. It forms yellow crystals and is used to make dyes. Chemical formula: C 12 H 8 N 2 .