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Phenazine is a yellowish crystalline organic compound with the molecular formula C12H8N2. It belongs to the pyrazine family, which are heterocyclic compounds containing a ring structure with four carbon atoms and two nitrogen atoms. Phenazines are also related to phenothiazine (containing sulfur) and phenoxazine (containing oxygen).1234

Phenazine itself is used in organic synthesis. Derivatives of phenazine are significant as dyes, with Perkin's mauve, aniline black, and indanthrene being well-known examples. Phenothiazine derivatives, such as chlorpromazine, are widely used as antipsychotic drugs.1254

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