pyrazine

Science Dictionary
pyrazine   (pĭr'ə-zēn')  Pronunciation Key 
Any of a group of organic compounds having a six-member ring in which the first and fourth atoms are nitrogen and the rest are carbon. Pyrazines are components of many important compounds, including pteridines, some vitamins and antibiotics, and numerous dyes called phenazines.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica
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pyrazine

any of a class of organic compounds of the heterocyclic series characterized by a ring structure containing four atoms of carbon and two of nitrogen. The pyrazine ring is part of many polycyclic compounds of biological or industrial significance. The simplest member of the pyrazine family is pyrazine itself, a colourless, water-soluble solid with molecular formula C4H4N2. Pyrazine is seldom prepared. Its hexahydro derivative, piperazine, was first made in 1888; several of its derivatives find use as chemical raw materials.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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