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pyrazine
CIDE DICTIONARY
pyrazine, n. [Pyridine + Gr. not + life.].
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. [Webster 1913 Suppl.]
For further exploring for "pyrazine" in Webster Dictionary Online