5-Chlorouracil
Also known as: 5-Chloro-2,4-dihydroxypyrimidine, 5-Chloropyrimidine-2,4(1H,3H)-dione, 5-Chloro-2,4(1H,3H)-pyrimidinedione, Uracil, 5-chloro-, NSC 28172, 5-Chloro-1H-pyrimidine-2,4-dione, 5-chloro-2,4-dioxopyrimidine, 5-chloro-uracil, Fluorouracil Related Compound E, MFCD00006019
5-Chlorouracil (CAS 1820-81-1) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C4H3ClN2O2 and a molecular weight of 146.53 g/mol. Key properties include a melting point of >300 °C(lit.), a density of 1.6±0.1 g/cm3 and a flash point of 203.9ºC. No supplier offers are currently listed; request a quote. Record last updated Nov 3, 2026.
- CAS No.
- 1820-81-1
- Jingsj CID
- J-35716-4
- Molecular Formula
- C4H3ClN2O2
- Molecular Weight
- 146.53 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.) |
|---|---|
| Density | 1.6±0.1 g/cm3 |
| Flash Point | 203.9ºC |
| Exact Mass | 145.988312 |
| PSA | 65.72000 |
| LogP | -0.52 |
| Vapor Pressure | 1.98E-07mmHg at 25°C |
| Refractive Index | 1.587 |
Customs & Trade Information
| HS Code | 2933599090 |
|---|---|
| Summary | 2933599090. other compounds containing a pyrimidine ring (whether or not hydrogenated) or piperazine ring in the structure. VAT:17.0%. Tax rebate rate:13.0%. . MFN tariff:6.5%. General tariff:20.0% |
Frequently Asked Questions
What is the CAS number of 5-Chlorouracil?
The CAS number of 5-Chlorouracil is 1820-81-1.
What are the molecular formula and molecular weight of 5-Chlorouracil?
5-Chlorouracil has molecular formula C4H3ClN2O2 and molecular weight 146.53 g/mol.
What are the upstream and downstream products of 5-Chlorouracil?
For 5-Chlorouracil, Upstream Products: Uracil, Methyl 2,4-dioxo-1,2,3,4-tetrahydropyrimidine-5-carboxylate, N-Chlorosuccinimide; Downstream Products: 5-Chloro-2'-deoxyuridine, Thymine, Parabanic acid.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "5-Chlorouracil (CAS 1820-81-1)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-35716-4 (accessed 2026-11-09).
Data for reference only; verify product details with suppliers before purchase.