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Definition of Pyrazine
1. n. A feebly basic solid, C4H4N2, obtained by distilling piperazine with zinc dust, and in other ways. Also, by extension, any of various derivatives of the same.
Definition of Pyrazine
1. Noun. (organic compound) A diazine in which the two nitrogen atoms are in the para- positions; many of its derivatives are pharmaceuticals. ¹
¹ Source: wiktionary.com