pyrazine

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pyrazine

(pĭr′ə-zēn′)
n.
1. A crystalline organic base, C4H4N2, having a six-member aromatic ring in which the first and fourth atoms are nitrogen and the rest are carbon.
2. Any of a group of compounds derived from or structurally related to this base. Pyrazines occur in pteridines, some vitamins, and certain dyes such as phenazine.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
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The closely matched peaks showed two doublets at 9.17 and 8.84 ppm of aromatic pyrazine ring in free PZ and its corresponding complexes having the integration of two protons each.
Incorporation of a pyrazine ring as the central unit is now being investigated with anticipation of attaching vinyl pyridyl substituents at the 2,3,5 and 6 positions.