Methylthiouracil
Also known as: 2,3-Dihydro-6-methyl-2-thioxo-4(1H)-pyrimidinone, 2-Mercapto-4-hydroxy-6-methylpyrimidine, 2-Mercapto-6-methylpyrimidin-4-ol, 2-Thio-6-methyl-1,3-pyrimidin-4-one, 4-Hydroxy-2-mercapto-6-methylpyrimidine, 4-Hydroxy-6-methyl-2-thiopyrimidine, 6-Methyl-2-thiouracil, 6-Methyl-2-thioxo-2,3-dihydropyrimidin-4(1H)-one, 6-Methyl-2-sulfanylpyrimidin-4-ol, 6-Methyl-2-sulfanylidene-1H-pyrimidin-4-one, Methiocil, Methiure, Metiur
Methylthiouracil (CAS 56-04-2) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C5H6N2OS and a molecular weight of 142.179 g/mol. Key properties include a melting point of ~330 °C (dec.)(lit.), a boiling point of 342.3ºC at 760 mmHg, a density of 1.4±0.1 g/cm3 and a flash point of 160.8ºC. It is classified under GHS with signal word Warning and hazard statements H302 — Harmful if swallowed and H351 — Suspected of causing cancer. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 56-04-2
- Jingsj CID
- J-45502-7
- Molecular Formula
- C5H6N2OS
- Molecular Weight
- 142.179 g/mol
- Category
- Pharma Intermediates
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | ~330 °C (dec.)(lit.) |
|---|---|
| Boiling Point | 342.3ºC at 760 mmHg |
| Density | 1.4±0.1 g/cm3 |
| Flash Point | 160.8ºC |
| Exact Mass | 142.020081 |
| PSA | 80.74000 |
| LogP | 0.31 |
| Refractive Index | 1.638 |
| Stability | Stability Incompatible with strong oxidizing agents, iodine, metals. |
| Additional Property | INSOLUBLE |
GHS Safety & Compliance
- H302 — Harmful if swallowed
- H351 — Suspected of causing cancer
Activity & Biological Data
| Target | NF-κB TNF-α IL-6 ERK1 ERK2 |
|---|---|
| Additional Information | [1]. Ku SK, et al. Anti-inflammatory effects of methylthiouracil in vitro and in vivo. Toxicol Appl Pharmacol. 2015 Nov 1;288(3):374-86. |
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 Methylthiouracil?
The CAS number of Methylthiouracil is 56-04-2.
What are the molecular formula and molecular weight of Methylthiouracil?
Methylthiouracil has molecular formula C5H6N2OS and molecular weight 142.179 g/mol.
Is Methylthiouracil hazardous?
Methylthiouracil has GHS signal word Warning and hazard statements H302 — Harmful if swallowed; H351 — Suspected of causing cancer.
What are the upstream and downstream products of Methylthiouracil?
For Methylthiouracil, Upstream Products: Ethyl acetoacetate, 5-Acetyl-2,2-dimethyl-1,3-dioxane-4,6-dione, Diethyl malonate; Downstream Products: 4-Hydroxy-6-methylpyrimidine, 6-Methyluracil, 4-Chloro-6-methyl-2-(methylthio)pyrimidine.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "Methylthiouracil (CAS 56-04-2)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-45502-7 (accessed 2026-11-09).
Data for reference only; verify product details with suppliers before purchase.