SHEET /m/cytosine · PubChem CID 597 · CAS 71-30-7 · REV 2026.07
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Cytosine
from sourceC4H5N3O · 111.1 g/mol
Cytosinimine
What is Cytosine?
The C of the genetic code. Sticking a methyl group on it is the main way a cell switches genes off without changing the DNA sequence. from source
CategoryBody
Chemical familyAmines
LeaderboardsBiggest
Fig. 1 · 2D structure RDKit
SMILES
C1=C(NC(=O)N=C1)NWhere you'll find it
Your own body makes this one. It is not an ingredient you buy. See the rest of the body group.
Toxicity & hazards
WarningIrritantH315, H319, H335from source