Isocytosine

Isocytosine
	IUPAC name 2-Amino-3H-pyrimidin-4-one
	Other names 2-Aminouracil
Identifiers
CAS number	108-53-2
PubChem	66950
ChemSpider	60309
ChEBI	CHEBI:55502
ChEMBL	CHEMBL56260
Jmol-3D images	Image 1
	SMILES O=C1/C=C\N=C(\N)N1 ;
	InChI InChI=1S/C4H5N3O/c5-4-6-2-1-3(8)7-4/h1-2H,(H3,5,6,7,8) ; Key: XQCZBXHVTFVIFE-UHFFFAOYSA-N InChI=1/C4H5N3O/c5-4-6-2-1-3(8)7-4/h1-2H,(H3,5,6,7,8); Key: XQCZBXHVTFVIFE-UHFFFAOYAD ;
Properties
Molecular formula	C4H5N3O
Molar mass	111.102
	(verify) (what is: /?); Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
	Infobox references

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Isocytosine or 2-aminouracil is a pyrimidine base that is an isomer of cytosine. It is used in combination with isoguanine in studies of unnatural nucleic acid analogues of the normal base pairs in DNA.

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