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 In organic chemistry, diazines are a group of organic compounds having the molecular formula . Each contains a benzene ring in which two of the C-H fragments have been replaced by isolobal nitrogen. There are three structural isomers: * pyridaz ...

, ring.

Derivatives

Derivatives of pyrimidone are the basis of many other biological molecules, including: *

Nucleobases Nucleobases, also known as ''nitrogenous bases'' or often simply ''bases'', are nitrogen-containing biological compounds that form nucleosides, which, in turn, are components of nucleotides, with all of these monomers constituting the basic b ...

, such as

cytosine Cytosine () ( symbol C or Cyt) is one of the four nucleobases 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 ...

* Barbiturates, such as

metharbital Metharbital was patented in 1905 by Emil Fischer working for Merck. It was marketed as Gemonil by Abbott Laboratories. It is a barbiturate anticonvulsant, used in the treatment of epilepsy. It has similar properties to phenobarbital Phenoba ...

File:Cytosine chemical structure.png,

Cytosine Cytosine () ( symbol C or Cyt) is one of the four nucleobases 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 ...

File:Metharbital.png,

Metharbital Metharbital was patented in 1905 by Emil Fischer working for Merck. It was marketed as Gemonil by Abbott Laboratories. It is a barbiturate anticonvulsant, used in the treatment of epilepsy. It has similar properties to phenobarbital Phenoba ...

*Antiulcer drugs including temelastine, icotidine, donetidine, and

lupitidine Lupitidine (INN; lupitidine hydrochloride (USAN); development code SKF-93479) is a long-acting H2 receptor antagonist developed by Smith, Kline & French and described as an antiulcerogenic that was never marketed. It was shown to inhibit noctur ...

. {{Heterocyclic-stub