Pyrimidone

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4-Pyrimidone

IUPAC name	Pyrimidone
Other names	Hydroxypyrimidine
Identifiers
CAS number	[51953-17-4]
PubChem	20695
SMILES	O=C1NC=NC=C1
Properties
Molecular formula	C₄H₄N₂O
Molar mass	96.09 g/mol
Appearance	White to light yellow powder
Melting point	163-168 °C
Hazards
Main hazards	Respiratory system, eye, skin irritation
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references

Pyrimidone is the name given to either of two heterocyclic compounds with the formula C₄H₄N₂O: 2-pyrimidone and 4-pyrimidone. The compounds can also be called 2-hydroxypyrimidine or 4-hydroxypyrimidine respectively, based on a substituted pyrimidine, or 1,3-diazine, ring.