4-Thiouracil
Also known as: 4-thioxo-3,4-dihydropyrimidin-2(1H)-one, 2-Hydroxy-4-mercaptopyrimidine, 4-Thioxo-1H-pyrimidin-2-one, 4-sulfanylidene-1,2,3,4-tetrahydropyrimidin-2-one, 2(1H)-Pyrimidinone, 3,4-dihydro-4-thioxo-, 4-Thioxo-3,4-dihydro-2(1H)-pyrimidinone, Uracil, 4-thio-, 4-thiouracyl
4-Thiouracil (CAS 591-28-6) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C4H4N2OS and a molecular weight of 128.152 g/mol. Key properties include a melting point of 295 °C (dec.)(lit.), a boiling point of 388.0±34.0 °C at 760 mmHg, a density of 1.5±0.1 g/cm3 and a flash point of 188.4±25.7 °C. It is classified under GHS with signal word Warning and hazard statements H302 — Harmful if swallowed, H312 — Harmful in contact with skin and H332 — Harmful if inhaled. It is listed by 1 supplier, from 25.00 to 60.00 CNY. Record last updated Aug 21, 2026.
- CAS No.
- 591-28-6
- Jingsj CID
- J-1366911-7
- Molecular Formula
- C4H4N2OS
- Molecular Weight
- 128.152 g/mol
- Category
- Pharma Intermediates
- Last updated
- 8/21/2026
| Supplier | Purity / Pack | Base Price | Unit Price | Origin | |
|---|---|---|---|---|---|
Made to OrderPlatform-operated | 99% 100g | ¥2,500.00 | $3.74 /gBest ¥25.00/g CNY | CN China MOQ 100g | |
Made to OrderPlatform-operated | 99% 25g | ¥800.00 | $4.79 /g ¥32.00/g CNY | CN China MOQ 25g | |
Made to OrderPlatform-operated | 99% 5g | ¥300.00 | $8.98 /g ¥60.00/g CNY | CN China MOQ 5g |
Physicochemical Properties
| Melting Point | 295 °C (dec.)(lit.) |
|---|---|
| Boiling Point | 388.0±34.0 °C at 760 mmHg |
| Density | 1.5±0.1 g/cm3 |
| Flash Point | 188.4±25.7 °C |
| Exact Mass | 128.004440 |
| PSA | 84.81000 |
| LogP | -0.60 |
| Vapor Pressure | 0.0±0.9 mmHg at 25°C |
| Refractive Index | 1.671 |
GHS Safety & Compliance
- H302 — Harmful if swallowed
- H312 — Harmful in contact with skin
- H332 — Harmful if inhaled
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 4-Thiouracil?
The CAS number of 4-Thiouracil is 591-28-6.
What are the molecular formula and molecular weight of 4-Thiouracil?
4-Thiouracil has molecular formula C4H4N2OS and molecular weight 128.152 g/mol.
Which suppliers offer 4-Thiouracil?
1 supplier(s) listed; reference unit price ¥25.00–60.00 /g.
Is 4-Thiouracil hazardous?
4-Thiouracil has GHS signal word Warning and hazard statements H302 — Harmful if swallowed; H312 — Harmful in contact with skin; H332 — Harmful if inhaled.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "4-Thiouracil (CAS 591-28-6)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1366911-7 (accessed 2026-11-06).
Data for reference only; verify product details with suppliers before purchase.