Skip to content
[P]pubcas
Independent chemical reference Compare
Home/Chemicals/259793-96-9
Chemical substance record

Favipiravir

259793-96-9C5H4FN3O2157.104 g/mol
Organic/Inorganic Small MoleculeChEBI source record

A member of the class of pyrazines that is pyrazine substituted by aminocarbonyl, hydroxy and fluoro groups at positions 2, 3 and 6, respectively. It is an anti-viral agent that inhibits RNA-dependent RNA polymerase of several RNA viruses and is approved for the treatment of influenza in Japan. — ChEBI

Safety references

Safety documents & references

Supplier matching matters

Find the safety document for your specific supplier, product number and grade.

Find a product-specific SDS

Search SDS PDFs Sigma-Aldrich Thermo Fisher

Safety guides and government classification records are not a manufacturer’s SDS. Match supplier, product number, concentration, physical form, region and revision before using a document.

Identity & molecular properties

Source-linked values
CAS number259793-96-9ChEBI ↗
Molecular formulaC5H4FN3O2ChEBI ↗
Molar mass157.104 g/molChEBI ↗
Monoisotopic mass157.02875 DaChEBI ↗
Formal charge0ChEBI ↗
ChEBI identifierCHEBI:134722ChEBI ↗

Cross-source molecular data

PubChem
Molar mass157.10 g/molPubChem ↗
Exact mass157.02875454 DaPubChem ↗
Computed XLogP-0.6PubChem ↗
Topological polar surface area (Ų)84.6PubChem ↗
H-bond donors2PubChem ↗
H-bond acceptors4PubChem ↗
Rotatable bonds1PubChem ↗

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
favipiravir
6-fluoro-3-hydroxypyrazine-2-carboxamide
ZCGNOVWYSGBHAU-UHFFFAOYSA-N
NC(=O)c1nc(F)cnc1O
InChI=1S/C5H4FN3O2/c6-2-1-8-5(11)3(9-2)4(7)10/h1H,(H2,7,10)(H,8,11)

Names & synonyms

6-fluoro-3-hydroxypyrazine-2-carboxamideAreplivirAvifavirAviganFavilavirFavipirafavipiravirum

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

Classification & relationships

ChEBI ontology
primary carboxamideChEBI parent class · 140324 ↗organofluorine compoundChEBI parent class · 37143 ↗hydroxypyrazineChEBI parent class · 71633 ↗
organofluorine compoundorganic heterocyclic compoundorganic molecular entity

Roles recorded in ChEBI

anticoronaviral agentEC 2.7.7.48 (RNA-directed RNA polymerase) inhibitorantiviral agentantiviral 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
0.00636521 mol

Uses 157.104 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 · 5 atoms
38.23%
N
Nitrogen · 3 atoms
26.75%
O
Oxygen · 2 atoms
20.37%
F
Fluorine · 1 atom
12.09%
H
Hydrogen · 4 atoms
2.57%

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
T-705 (Favipiravir) suppresses tumor necrosis factor α production in response to influenza virus infection: A beneficial feature of T-705 as an anti-influenza drug. ↗Acta virologica · 2017 · PMID 28105854
Synthesis of T-705-Ribonucleoside and T-705-Ribonucleotide and Studies of Chemical Stability. ↗ChemMedChem · 2017 May 9 · PMID 28324644
Search PubMed Google Scholar

Sources & record history

Checked 27 Sep 2026
EMBL-EBI ChEBI · CHEBI:134722

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

NCBI PubChem · CID 492405 · 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.

How this record was assembledSuggest a correction