4-Methylpyrazole
Also known as: Fomepizole, 4-Methyl-1H-pyrazole, 1H-Pyrazole, 4-methyl-, 4-MP, Antizol, Fomepizol
4-Methylpyrazole (CAS 7554-65-6) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C4H6N2 and a molecular weight of 82.104 g/mol. Key properties include a melting point of 13°C, a boiling point of 243.6±0.0 °C at 760 mmHg, a density of 1.1±0.1 g/cm3 and a flash point of 96.1±0.0 °C. It is classified under GHS with signal word Warning and hazard statements H302 — Harmful if swallowed, H315 — Causes skin irritation and H319 — Causes serious eye irritation. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 7554-65-6
- Jingsj CID
- J-19320-4
- Molecular Formula
- C4H6N2
- Molecular Weight
- 82.104 g/mol
- Category
- Pharma Intermediates
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | 13°C |
|---|---|
| Boiling Point | 243.6±0.0 °C at 760 mmHg |
| Density | 1.1±0.1 g/cm3 |
| Flash Point | 96.1±0.0 °C |
| Exact Mass | 82.053101 |
| PSA | 28.68000 |
| LogP | 0.78 |
| Vapor Pressure | 0.1±0.4 mmHg at 25°C |
| Refractive Index | 1.523 |
| Additional Property | soluble |
GHS Safety & Compliance
- H302 — Harmful if swallowed
- H315 — Causes skin irritation
- H319 — Causes serious eye irritation
- H335 — May cause respiratory irritation
Activity & Biological Data
| Additional Information | [1]. Casavant MJ. Fomepizole in the treatment of poisoning. Pediatrics. 2001 Jan;107(1):170. [2]. Lepik KJ, et al. Adverse drug events associated with the antidotes for methanol and ethylene glycol poisoning: a comparison of ethanol and fomepizole. Ann Emerg Med. 2009 Apr;53(4):439-450.e10. |
|---|
Customs & Trade Information
| HS Code | 2933199090 |
|---|---|
| Summary | 2933199090. other compounds containing an unfused pyrazole ring (whether or not hydrogenated) 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-Methylpyrazole?
The CAS number of 4-Methylpyrazole is 7554-65-6.
What are the molecular formula and molecular weight of 4-Methylpyrazole?
4-Methylpyrazole has molecular formula C4H6N2 and molecular weight 82.104 g/mol.
Is 4-Methylpyrazole hazardous?
4-Methylpyrazole has GHS signal word Warning and hazard statements H302 — Harmful if swallowed; H315 — Causes skin irritation; H319 — Causes serious eye irritation.
What are the upstream and downstream products of 4-Methylpyrazole?
For 4-Methylpyrazole, Upstream Products: 1,1,3,3-Tetraethoxy-2-methylpropane, 4-Methyl-1H-pyrazole-3-carboxylic acid; Downstream Products: 1H-Pyrazole-4-carboxylic acid, 1,4-Dimethyl-1H-pyrazole, 1-Phenyl-4-methylpyrazole.
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-Methylpyrazole (CAS 7554-65-6)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-19320-4 (accessed 2026-11-09).
Data for reference only; verify product details with suppliers before purchase.