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Chemical substance record

Sulfisoxazole

127-69-5C11H13N3O3S267.31 g/mol
Organic/Inorganic Small MoleculeChEBI source record

A sulfonamide antibacterial with an oxazole substituent. It has antibiotic activity against a wide range of gram-negative and gram-positive organisms. — ChEBI

Safety references

Safety documents & references

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Identity & molecular properties

Source-linked values
CAS number127-69-5ChEBI ↗
Molecular formulaC11H13N3O3SChEBI ↗
Molar mass267.31 g/molChEBI ↗
Monoisotopic mass267.06776 DaChEBI ↗
Formal charge0ChEBI ↗
ChEBI identifierCHEBI:102484ChEBI ↗

Cross-source molecular data

PubChem
Molar mass267.31 g/molPubChem ↗
Exact mass267.06776246 DaPubChem ↗
Computed XLogP1PubChem ↗
Topological polar surface area (Ų)107PubChem ↗
H-bond donors2PubChem ↗
H-bond acceptors6PubChem ↗
Rotatable bonds3PubChem ↗

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
sulfisoxazole
4-amino-N-(3,4-dimethylisoxazol-5-yl)benzenesulfonamide
NHUHCSRWZMLRLA-UHFFFAOYSA-N
Cc1noc(NS(=O)(=O)c2ccc(N)cc2)c1C
InChI=1S/C11H13N3O3S/c1-7-8(2)13-17-11(7)14-18(15,16)10-5-3-9(12)4-6-10/h3-6,14H,12H2,1-2H3

Names & synonyms

4-amino-N-(3,4-dimethylisoxazol-5-yl)benzenesulfonamidesulfafurazolesulfafurazolum

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

Classification & relationships

ChEBI ontology
sulfonamideChEBI parent class · 35358 ↗isoxazolesChEBI parent class · 55373 ↗sulfonamide antibioticChEBI parent class · 87228 ↗
organosulfur compoundorganic heterocyclic compoundorganic molecular entity

Roles recorded in ChEBI

antibacterial agentantibacterial drugophthalmology drugdrug allergen

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
0.00374097 mol

Uses 267.31 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 · 11 atoms
49.43%
O
Oxygen · 3 atoms
17.96%
N
Nitrogen · 3 atoms
15.72%
S
Sulfur · 1 atom
12.00%
H
Hydrogen · 13 atoms
4.90%

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
Randomized, controlled trial comparing long-term sulfonamide therapy to ventilation tubes for otitis media with effusion. ↗Pediatrics · 1991 Aug · PMID 1861917
Biological properties of 4-sulfanilamido-3,6-dimethoxypyridazine (CS-61)--a new sulfonamide. ↗Arzneimittel-Forschung · 1965 Dec · PMID 4960234
US2430094 · Patent reference ↗Patent cross-reference supplied by ChEBI. Association alone does not establish claim scope.
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Sources & record history

Checked 27 Sep 2026
EMBL-EBI ChEBI · CHEBI:102484

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

NCBI PubChem · CID 5344 · 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.

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