C4H5N3O
111.1 g/mol
Research ReagentWarning
Cytosine
CAS71-30-7EC200-749-5
Category
Research Reagent
Compound Class
Heterocycle
Primary Use
Research Compound
Cytosine is an aminopyrimidine that functions as a pyrimidine nucleobase found in nucleic acids. It is a naturally occurring compound and serves as a metabolite in various organisms, including humans.
biochemical research reagentcomponent of nucleic acids
Content scope: Information here supports chemical identification and industrial supply, research, and manufacturing contexts. It is not a therapeutic claim, medical advice, or drug-use instructions.
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Related Compounds
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research compound
Referencestereoisomer of
Cytosine-5,6-d2
CAS106391-24-6
research compound
Referencesame scaffold
5-fluorocytosine
CAS2022-85-7
pharmaceutical raw material
Referencesame scaffold
5-Bromo-2-hydroxypyrimidine
CAS38353-06-9
research compound
Referencesame scaffold
2-Hydroxypyrimidine hydrochloride
CAS38353-09-2
research compound
Safety Reference
Warning
H315Causes skin irritation
H319Causes serious eye irritation
H335May cause respiratory irritation
Customs Tariff Classification
The international HS code for Cytosine (CAS 71-30-7) is 2933.59.
HS code (international, 6-digit)
2933.59
EU CN code (8-digit)
2933 59 95
Classification per the EU customs inventory ECICS (2026-07 snapshot, HS 2022). National tariff lines and product form can affect the final classification.
Identifiers
IUPAC Name
6-amino-1H-pyrimidin-2-one
InChIKey
OPTASPLRGRRNAP-UHFFFAOYSA-N
SMILES
C1=C(NC(=O)N=C1)N
Synonyms (49)
- Cytosine, United States Pharmacopeia (USP)
- Gemcitabine impurity A, European Pharmacopoeia (EP)
- Lamivudine EP Impurity E
- Lamivudine EP Impurity E; Gemcitabine EP Impurity A
- 2(1H)-Pyrimidinone, 4-amino-
- 2(1H)-pyrimidinone, 6-amino-
- 2-Hydroxy-6-amino-pyrimidin
- 3h-cytosine
- 4-Amino-1H-pyrimidin-2-one
- 4-Amino-2(1H)-pyrimidinone
- 4-Amino-2(1H)pyrimidone
- 4-Amino-2-hydroxypyrimidine
- 4-Amino-2-oxypyrimidine
- 4-Aminouracil
- 4-amino-2-pyrimidinol
- 4-amino-3h-pyrimidin-2-one
- 4-aminopyrimidin-2(1H)-one
- 4-aminopyrimidin-2-ol
- 6-Aminopyrimidin-2(1h)-One
- 6-amino-1H-pyrimidin-2-one
- Cyt
- Cytosin
- Cytosine (8CI)
- Cytosine (Standard)
- Cytosine, >=99.0% (HPLC)
- Cytosinimine
- Gemcitabine impurity A CRS
- LAMIVUDINE IMPURITY E
- Lamivudine impurity c
- Lamivudine impurity c rs
- Zytosin
- aminopyrimidone
- cytosine
- iminopyrimidinone
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