Cytosine
Also known as: 4-amino-2-hydroxypyrimidine, 4-amino-2(1H)-pyrimidinone, 2(1H)-Pyrimidinone, 4-amino-, 4-amino-2-oxo-1,2-dihydropyrimidine, 4-aminopyrimidin-2-one, Cyt, Cytosinimine
Cytosine (CAS 71-30-7) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C4H5N3O and a molecular weight of 111.102 g/mol. Key properties include a melting point of >300 °C(lit.), a boiling point of 445.8ºC at 760 mmHg, a density of 1.6±0.1 g/cm3 and a flash point of 223.4ºC. It is classified under GHS with signal word Warning and hazard statements H315 — Causes skin irritation, H319 — Causes serious eye irritation and H335 — May cause respiratory irritation. No supplier offers are currently listed; request a quote. Record last updated Nov 3, 2026.
- CAS No.
- 71-30-7
- Jingsj CID
- J-47622-1
- Molecular Formula
- C4H5N3O
- Molecular Weight
- 111.102 g/mol
- Category
- Pharma Intermediates
- Last updated
- 11/3/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | >300 °C(lit.) |
|---|---|
| Boiling Point | 445.8ºC at 760 mmHg |
| Density | 1.6±0.1 g/cm3 |
| Flash Point | 223.4ºC |
| Exact Mass | 111.043259 |
| PSA | 71.77000 |
| LogP | -2.29 |
| Refractive Index | 1.689 |
| Stability | Stable. Incompatible with strong oxidizing agents. |
| Additional Property | soluble |
GHS Safety & Compliance
- H315 — Causes skin irritation
- H319 — Causes serious eye irritation
- H335 — May cause respiratory irritation
Activity & Biological Data
| Target | Human Endogenous Metabolite |
|---|
Customs & Trade Information
| HS Code | 2933591000 |
|---|---|
| Summary | HS:2933591000 4-aminopyrimidin-2(1h)-one VAT:17.0% Tax rebate rate:9.0% Supervision conditions:none MFN tariff:6.5% General tariff:20.0% |
Frequently Asked Questions
What is the CAS number of Cytosine?
The CAS number of Cytosine is 71-30-7.
What are the molecular formula and molecular weight of Cytosine?
Cytosine has molecular formula C4H5N3O and molecular weight 111.102 g/mol.
Is Cytosine hazardous?
Cytosine has GHS signal word Warning and hazard statements H315 — Causes skin irritation; H319 — Causes serious eye irritation; H335 — May cause respiratory irritation.
What are the upstream and downstream products of Cytosine?
For Cytosine, Upstream Products: 3,3-Diethoxypropanenitrile, (E)-3-Ethoxyacrylonitrile, 2'-Deoxycytidine; Downstream Products: Dichloroacetonitrile, N-(Trimethylsilyl)-2-[(trimethylsilyl)oxy]pyrimidin-4-amine, Dihydrouracil.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "Cytosine (CAS 71-30-7)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-47622-1 (accessed 2026-11-06).
Data for reference only; verify product details with suppliers before purchase.