1. 
   Pyrazine
   Pyr'a·zine noun Also -zin [ Pyr idine + Greek ... not + ... life.] (Org. Chem.) A feebly basic solid, C ₄ H ₄ N ₂ , obtained by distilling piperazine with zinc dust, and in other ways. Also, by extensi...
   Found op http://www.encyclo.co.uk/webster/P/203
   
   
2. 
   Pyrazine
   • Alt. of -zin
   Found op http://thinkexist.com/dictionary/meaning/pyrazine/
   
   
3. 
   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 ...
   Found op http://www.britannica.com/eb/a-z/p/137
   
   
4. 
   Pyrazine
   Pyrazine is a heterocyclic aromatic organic compound with the chemical formula C4H4N2. Pyrazine is a symmetrical molecule with point group D2h. Derivatives like phenazine are well known for their antitumor, antibiotic and diuretic activity. Pyrazine is less basic in nature than pyridine, pyridazine...
   Found op http://en.wikipedia.org/wiki/Pyrazine
   
   
5. 
   Pyrazine
   See below Methoxypyrazine .
   Found op http://www.wein-plus.eu/en/Pyrazines_3.0.10562.html
   
   

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