What is "pyrazine"

Pyrazine \Pyr"a*zine\, n. Also -zin \-zin\ . [Pyridine + Gr. ? not + ? life.] (Org. Chem.) 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.

n. (context organic compound English) A diazine in which the two nitrogen atoms are in the para- positions; many of its derivatives are pharmaceuticals.

Pyrazine is a heterocyclic aromatic organic compound with the chemical formula CHN.

Pyrazine is a symmetrical molecule with point group D. Pyrazine is less basic than pyridine, pyridazine and pyrimidine.

Derivatives such as phenazine are well known for their antitumor, antibiotic and diuretic activities.

Tetramethylpyrazine (also known as ligustrazine) is reported to scavenge superoxide anion and decrease nitric oxide production in human polymorphonuclear leukocytes, and is a component of some herbs in traditional Chinese medicine.