Chemicals and Drugs

Cytosine

A pyrimidine base that is a fundamental unit of nucleic acids.

National Library of MedicineMedical Subject Headings2026

Structured Summary

Abstract

A pyrimidine base that is a fundamental unit of nucleic acids.

Chemical Identity

Chemical Information

Molecular Formula
C4H5N3O
Molecular Weight
111.10 g/mol
CAS Registry No.
71-30-7
IUPAC Name
6-amino-1H-pyrimidin-2-one
InChIKey
OPTASPLRGRRNAP-UHFFFAOYSA-N
SMILES
C1=C(NC(=O)N=C1)N
MeSH Unique ID
D003596
Source
PubChem CID 597

MeSH Record

Classification

Broader headings

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Related Concepts

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MeSH Record

Aspects Covered

27 allowable subheadings

Indexed with the subheadings administration & dosage, adverse effects, agonists, analogs & derivatives, analysis, antagonists & inhibitors, biosynthesis, blood, cerebrospinal fluid, chemical synthesis, chemistry, classification, economics, history, immunology, isolation & purification, metabolism, pharmacokinetics, pharmacology, physiology, poisoning, radiation effects, standards, supply & distribution, therapeutic use, toxicity, urine.

MeSH Record

Indexing Annotation

/biosyn /physiol permitted

MeSH Hierarchy

Tree Number

  1. D03w.383.742.698.421w

AMA Style

References

  1. National Library of Medicine. Cytosine. Medical Subject Headings (MeSH). 2026. Unique ID D003596. http://id.nlm.nih.gov/mesh/2026/D003596
  2. Cytosine. In: Wikipedia. https://en.wikipedia.org/wiki/Cytosine
  3. Cytosine. In: Wikidata. https://www.wikidata.org/wiki/Q178425
  4. Cytosine. In: PubChem Compound. CID 597. https://pubchem.ncbi.nlm.nih.gov/compound/597