Chemical substance record

Paclobutrazol

76738-62-0C₁₅H₂₀ClN₃O293.792 g/mol

Organic/Inorganic Small MoleculeChEBI source record

A racemate comprising equimolar amounts of (2R,3R)- and (2S,3S)-1-(4-chlorophenyl)-4,4-dimethyl-2-(1H-1,2,4-triazol-1-yl)pentan-3-ol. It acts as a plant-growth retardant and fungicide via inhibition of gibberellin biosynthesis. — 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 number	76738-62-0	ChEBI ↗
Molecular formula	C₁₅H₂₀ClN₃O	ChEBI ↗
Molar mass	293.792 g/mol	ChEBI ↗
Monoisotopic mass	293.12949 Da	ChEBI ↗
Formal charge	0	ChEBI ↗
ChEBI identifier	CHEBI:73162	ChEBI ↗

Names & structural identifiers

Copy any identifier

Source preferred name

paclobutrazol

IUPAC name

rac-(2R,3R)-1-(4-chlorophenyl)-4,4-dimethyl-2-(1H-1,2,4-triazol-1-yl)pentan-3-ol

Names & synonyms

ClipperCultarFriazoleParlayrac-(2R,3R)-1-(4-chlorophenyl)-4,4-dimethyl-2-(1H-1,2,4-triazol-1-yl)pentan-3-olrac-(2S,3S)-1-(4-chlorophenyl)-4,4-dimethyl-2-(1H-1,2,4-triazol-1-yl)pentan-3-olTrimmit

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

Classification & relationships

ChEBI ontology

racemateChEBI parent class · 60911 ↗

Roles recorded in ChEBI

agrochemicalplant growth retardantantifungal agentgibberellin biosynthesis inhibitorEC 1.14.13.78 (ent-kaurene oxidase) inhibitor

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

0.00340377 mol

Uses 293.792 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 · 15 atoms

61.32%

N

Nitrogen · 3 atoms

14.30%

Cl

Chlorine · 1 atom

12.07%

H

Hydrogen · 20 atoms

6.86%

O

Oxygen · 1 atom

5.45%

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

Characterization of ent-kaurene oxidase activity from Gibberella fujikuroi. ↗Biochimica et biophysica acta · 1990 Nov 9 · PMID 2223832

Chlorocholine chloride and paclobutrazol treatments promote carbohydrate accumulation in bulbs of Lilium Oriental hybrids 'Sorbonne'. ↗Journal of Zhejiang University. Science. B · 2012 Feb · PMID 22302427

DE2734426 · Patent reference ↗Patent cross-reference supplied by ChEBI. Association alone does not establish claim scope.

US4243405 · Patent reference ↗Patent cross-reference supplied by ChEBI. Association alone does not establish claim scope.

WO2006018266 · Patent reference ↗Patent cross-reference supplied by ChEBI. Association alone does not establish claim scope.

Search PubMed Google Scholar

Sources & record history

Checked 27 Sep 2026

Identity, formula, mass, synonyms & ontologyEMBL-EBI ChEBI · CHEBI:73162

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

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 assembled Suggest a correction