NH2.CNH.NH2

from The Collaborative International Dictionary of English v.0.48
Guanidine \Gua"ni*dine\, n. (Physiol. Chem.)
   A strongly alkaline base, {NH2.CNH.NH2}, formed by the
   oxidation of guanin, and also obtained combined with methyl
   in the decomposition of creatin. Boiled with dilute sulphuric
   acid, it yields urea and ammonia.
   [1913 Webster]
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