Citozin je dušikova baza, ki je sestavina nukleozidov citidina in deoksicitidina, nukleotidov in nukleinskih kislin.[1] V svoji zgradbi ima pirimidinski heterociklični obroč.
| Citozin | |
|---|---|
| Kemijsko ime | 4-aminopirimidin-2(1H)-on |
| Kemijska formula | C4H5N3O |
| Molska masa | 111,10 g/mol |
| Vrelišče | 320–325 °C (decomp) |
| CAS število | 71-30-7 |
| SMILES | NC1=NC(NC=C1)=O |
 | |
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