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Names | |
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Preferred IUPAC name
4-Aminopyrimidin-2(1H)-one | |
Other names
4-Amino-1H-pyrimidine-2-one
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Identifiers | |
3D model (JSmol)
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ChEBI | |
ChEMBL | |
ChemSpider | |
ECHA InfoCard | 100.000.681 |
KEGG | |
MeSH | Cytosine |
PubChem CID
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UNII | |
CompTox Dashboard (EPA)
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Properties | |
C4H5N3O | |
Molar mass | 111.10 g/mol |
Density | 1.55 g/cm3 (calculated) |
Melting point | 320 to 325 °C (608 to 617 °F; 593 to 598 K) (decomposes) |
Acidity (pKa) | 4.45 (secondary), 12.2 (primary)[1] |
-55.8·10−6 cm3/mol | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Cytosine (/ˈsaɪtəˌsiːn, -ˌziːn, -ˌsɪn/[2][3]) (symbol C or Cyt) is one of the four nucleotide bases found in DNA and RNA, along with adenine, guanine, and thymine (uracil in RNA). It is a pyrimidine derivative, with a heterocyclic aromatic ring and two substituents attached (an amine group at position 4 and a keto group at position 2). The nucleoside of cytosine is cytidine. In Watson–Crick base pairing, it forms three hydrogen bonds with guanine.
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