NH2CNHNH2

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]