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Chemical substance record

Fomepizole

7554-65-6C4H6N282.106 g/mol

A member of the class of pyrazoles that is 1H-pyrazole substituted by a methyl group at position 4. — ChEBI

Safety references

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Identity & molecular properties

Source-linked values
CAS number7554-65-6ChEBI ↗
Molecular formulaC4H6N2ChEBI ↗
Molar mass82.106 g/molChEBI ↗
Monoisotopic mass82.0531 DaChEBI ↗
Formal charge0ChEBI ↗
ChEBI identifierCHEBI:5141ChEBI ↗

Cross-source molecular data

PubChem
Molar mass82.10 g/molPubChem ↗
Exact mass82.053098200 DaPubChem ↗
Computed XLogP1.4PubChem ↗
Topological polar surface area (Ų)28.7PubChem ↗
H-bond donors1PubChem ↗
H-bond acceptors1PubChem ↗
Rotatable bonds0PubChem ↗

PubChem computed values are shown separately from the ChEBI record. An exact InChIKey match was used to connect the records. Molecular descriptors do not describe a supplied product’s purity, particle size or performance.

Names & structural identifiers

Copy any identifier
fomepizole
4-methyl-1H-pyrazole
RIKMMFOAQPJVMX-UHFFFAOYSA-N
Cc1cnnc1
InChI=1S/C4H6N2/c1-4-2-5-6-3-4/h2-3H,1H3,(H,5,6)

Names & synonyms

4-methyl-1H-pyrazoleAntizolfomepizolfomepizolum

Names are supplied by ChEBI. Trade names and related synonyms may describe a broader product context.

Classification & relationships

ChEBI ontology

Roles recorded in ChEBI

antidoteprotective agentEC 1.1.1.1 (alcohol dehydrogenase) inhibitorophthalmology drug

Database role annotations describe reported biological or chemical roles; they are not product approvals or recommendations for use.

Mass ↔ amount of substance

Calculated from sourced mass
Equivalent amount
0.0121794 mol

Uses 82.106 g/mol from ChEBI. Assumes the substance described by this record; no purity or concentration correction is applied.

Elemental composition

Theoretical mass fractions
C
Carbon · 4 atoms
58.51%
N
Nitrogen · 2 atoms
34.12%
H
Hydrogen · 6 atoms
7.37%

Calculated theoretical mass fractions from the reported formula and PubChem periodic-table atomic masses. These are not assay or purity results.

Research & patent references

Selected source associations
Fomepizole for the treatment of methanol poisoning. ↗The New England journal of medicine · 2001 Feb 8 · PMID 11172179

Sources & record history

Checked 27 Sep 2026
EMBL-EBI ChEBI · CHEBI:5141

Release 255, 9 September 2026. ChEBI three-star (manually annotated) source entry. View original record ↗ · CC BY 4.0

NCBI PubChem · CID 3406 · retrieved 2026-09-27

PubCAS formats source data, connects references and computes explicitly labelled conversions. CAS cross-references are supplied by ChEBI; they do not constitute CAS verification or endorsement.