C2H4NH2
Piperazine Pi*per"a*zine, n. Also -zin -zin . [Piperidine + azote + -ine.] (Chem.) A crystalline substance, {(C2H4NH)2}, formed by action of ammonia on ethylene bromide, by reduction of pyrazine, etc. It is a strong base, and is used as a remedy for gout. [Webster 1913 Suppl.]

The Collaborative International Dictionary of English. 2000.

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