Guanine
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| Guanine | |
|---|---|
| Chemical name | 2-Amino-1H-purin-6(9H)-one |
| Alternate name | 2-amino-6-oxo-purine |
| Chemical formula | C5H5N5O |
| Molecular mass | 151.13 g/mol |
| Melting point | 360 °C |
| CAS number | 73-40-5 |
| SMILES | NC(NC1=O)=NC2=C1N=CN2 |
| Missing image Guanine_chemical_structure.png Chemical structure of guanine | |
Guanine is one of the four main nucleobases found in nucleic acids (e.g., DNA and RNA). Guanine is a purine derivative, and in Watson-Crick base pairing forms three hydrogen bonds with cytosine. Guanine "stacks" vertically with the other nucleobases via aromatic interactions. Guanine is a tautomer (see keto-enol tautomerism). The guanine nucleoside is called guanosine.
Guanine is also the name of a white amorphous substance found in the scales of certain fishes, the guano of sea-birds, and the liver and pancreas of mammals.
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