Chemical substance record

Parbendazole

14255-87-9C₁₃H₁₇N₃O₂247.298 g/mol

Organic/Inorganic Small MoleculeChEBI source record

A member of the class of benzimidazoles that is 1H-benzimidazole substituted by (methoxycarbonyl)amino and butyl groups at positions 2 and 5, respectively. It is a potent inhibitor of microtubule assembly and also exhibits anthelminthic activity. — ChEBI

Safety references

Safety documents & references

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Identity & molecular properties

Source-linked values

CAS number	14255-87-9	ChEBI ↗
Molecular formula	C₁₃H₁₇N₃O₂	ChEBI ↗
Molar mass	247.298 g/mol	ChEBI ↗
Monoisotopic mass	247.13208 Da	ChEBI ↗
Formal charge	0	ChEBI ↗
ChEBI identifier	CHEBI:94267	ChEBI ↗

Cross-source molecular data

PubChem

Molar mass	247.29 g/mol	PubChem ↗
Exact mass	247.132076794 Da	PubChem ↗
Computed XLogP	3.4	PubChem ↗
Topological polar surface area (Å²)	67	PubChem ↗
H-bond donors	2	PubChem ↗
H-bond acceptors	3	PubChem ↗
Rotatable bonds	5	PubChem ↗

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

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Source preferred name

parbendazole

IUPAC name

methyl (5-butyl-1H-benzimidazol-2-yl)carbamate

InChIKey

YRWLZFXJFBZBEY-UHFFFAOYSA-N

SMILES

CCCCc1ccc2nc(NC(=O)OC)nc2c1

InChI

InChI=1S/C13H17N3O2/c1-3-4-5-9-6-7-10-11(8-9)15-12(14-10)16-13(17)18-2/h6-8H,3-5H2,1-2H3,(H2,14,15,16,17)

Names & synonyms

HelatacHelmatacmethyl (5-butyl-1H-benzimidazol-2-yl)carbamateparbendazolparbendazolum

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

Classification & relationships

ChEBI ontology

benzimidazolesChEBI parent class · 22715 ↗carbamate esterChEBI parent class · 23003 ↗

ester organic heterocyclic compound organic molecular entity

Roles recorded in ChEBI

anthelminthic drugantinematodal drugantineoplastic agentmicrotubule-destabilising agent

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

Amount

Input unit

Equivalent amount

0.0040437 mol

Uses 247.298 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 · 13 atoms

63.14%

N

Nitrogen · 3 atoms

16.99%

O

Oxygen · 2 atoms

12.94%

H

Hydrogen · 17 atoms

6.93%

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

[The teratogenic action of parbendazole]. ↗Therapie · 1976 Jul-Aug · PMID 1036798

[Concerning the toxicity of parbendazole (Helmatac 30) to horses and ponies (author's transl)]. ↗Tijdschrift voor diergeneeskunde · 1975 Nov 1 · PMID 1242825

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Sources & record history

Checked 27 Sep 2026

Identity, formula, mass, synonyms & ontologyEMBL-EBI ChEBI · CHEBI:94267

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

Additional molecular descriptorsNCBI PubChem · CID 26596 · 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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