
1) Agmatine 2) Iminourea
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https://www.crosswordclues.com/clue/guanidine

==Structure== Guanidine can be thought of as a nitrogenous analogue of carbonic acid functional group. That is, the C=O group in carbonic acid is replaced by a C=NH group, and each OH is replaced by a NH2 group. A detailed crystallographic analysis of guanidine was elucidated 148 years after its first synthesis, despite the simplicity of the molec...
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http://en.wikipedia.org/wiki/Guanidine

• (n.) A strongly alkaline base, CN3H5, 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.
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http://thinkexist.com/dictionary/meaning/guanidine/

<biochemistry> This compound is a by-product of protein metabolism and is found inurine, the hydrochloride version is used to denature and dissolve proteins. ... (09 Oct 1997) ...
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http://www.encyclo.co.uk/local/20973
Gua'ni·dine noun (Physiol. Chem.) A strongly alkaline base, CN
3 H
5 , 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.
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http://www.encyclo.co.uk/webster/G/63

Type: Term Pronunciation: gwahn′i-dēn, -din Definitions: 1. A strongly basic compound, usually found (in some plants and lower animals) as the hydrochloride; a constituent of creatine and arginine.
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http://www.medilexicon.com/medicaldictionary.php?t=38682

a colorless, crystalline, strongly alkaline, water-soluble solid, CHN, used chiefly in the manufacture of plastics, resins, rubber accelerators, and explosives. Also called
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https://www.infoplease.com/dictionary/guanidine
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