Molekula
Cytosine
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 2000 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
Cytosine is a pyrimidine nucleobase essential in DNA and RNA synthesis, widely used as a biochemical reagent in molecular biology, pharmaceutical research, and genetic studies. It serves as a building block for nucleotides and is used as a starting material in the synthesis of cytidine nucleoside analogues such as the antiviral lamivudine. Cytosine has a CAS number of 71-30-7, a molecular formula of C4H5N3O, and a molecular weight of 111.10 g/mol. It is stored at ambient conditions with a signal word of "Warning" for safety. Molekula supplies Cytosine from research to bulk quantities with full documentation and ISO 9001:2015 traceability.
Example image for illustration only. Other packaging and pack sizes are available.
Pricing & pack sizes
These pack sizes aren't a limit. Molekula manufactures, sources and repacks to order — if you need 500 kg and only see 1 kg listed, . We quote from grams to multi-tonne.
Need a different size? Add the nearest pack and change the size in your basket — we price it at the same rate per unit.
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25 g — £30.90 per pack ex VAT · £37.08 inc. VAT
Need a different quantity or pack?
Tell us how much you need and when — drums, IBCs, sacks or a one-off bulk lot. We'll manufacture or source it and come back with a price.
Prices exclude VAT/sales tax and shipping.
Specifications
| Property | Value |
|---|---|
| Appearance | White to off-white powder |
| Heavy metals | <10ppm |
| Loss on Drying | <0.5% |
| Assay | >99% |
| Residue on Ignition | <0.5% |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Acidity | Neutral |
Literature values
Published physical properties of the substance, not batch specifications.
| Property | Value |
|---|---|
| Vapour Pressure | 0.00109 mmHg |
Source: PubChem CID 597 (Haz-Map)
Identification
| Property | Value |
|---|---|
| SKU | 29052273 |
| CAS Number | 71-30-7 |
| IUPAC Name | 6-amino-1H-pyrimidin-2-one |
| EC Number | 200-749-5 |
| Molecular Formula | C4H5N3O |
| Molecular Weight | 111.10 |
| Exact Mass | 111.0433 |
| SMILES | C1=C(NC(=O)N=C1)N |
| InChIKey | OPTASPLRGRRNAP-UHFFFAOYSA-N |
| InChI | InChI=1S/C4H5N3O/c5-3-1-2-6-4(8)7-3/h1-2H,(H3,5,6,7,8) |
| PubChem CID | 597 |
| REACH Code | Y110 |
| TSCA Listed | Yes |
| Tariff Code | 2933599590 |
Safety & GHS
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Health Hazard
GHS07
Hazard statements
- H315 Causes skin irritation
- H319 Causes serious eye irritation
- H335 May cause respiratory irritation
Precautionary statements
- P261 Avoid breathing dust/fume/gas/mist/vapours/spray
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P305+351+338 IF IN EYES: Rinse with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing
Documents
Safety Data Sheets (SDS)
Available in English, French, German, Italian, Spanish.
Certificate of Analysis (CoA) by batch
Enter a lot or batch number to retrieve the CoA for that specific batch. We can generate one from spec data if no PDF is on file.
Synonyms
- 2(1H)-Pyrimidinone, 4-amino-
- 4-Amino-2-hydroxypyrimidine
- 4-Amino-2(1H)-pyrimidinone
- 4-amino-3h-pyrimidin-2-one
- 4-aminopyrimidin-2(1H)-one
- 4-Aminouracil
- 6-amino-1,2-dihydropyrimidin-2-one
- 6-amino-1H-pyrimidin-2-one
- 6-Aminopyrimidin-2(1h)-One
- Cytosinimine
Frequently asked questions
What is cytosine primarily used for?
Cytosine is primarily used as a nucleobase in DNA and RNA, as well as in biochemical research, pharmaceutical synthesis, and as a precursor for nucleotide production.
What is the chemical formula and molecular weight of cytosine?
The chemical formula is C₄H₅N₃O, and the molecular weight is 111.10 g/mol.
How should cytosine be stored?
Store cytosine at ambient temperature in a dry, well-ventilated area, away from moisture and direct sunlight.
What grades of cytosine does Molekula supply?
Molekula supplies analytical standard grade and biochemical grade cytosine, suitable for research and industrial applications.
Can Molekula supply cytosine in bulk quantities?
Yes, we offer bulk packaging options (5 kg, 25 kg, and custom quantities) for cytosine, subject to availability and order requirements.
What documentation comes with a cytosine order?
Each order includes a Certificate of Analysis (CoA), Material Safety Data Sheet (MSDS), and batch-specific documentation for traceability.
Ready to order or need a custom pack?
Tell us the product, grade, and quantity — Molekula usually responds within one working day with pricing and lead time.