Home/Chemicals/73-32-5

Chemical substance record

L-isoleucine

73-32-5C₆H₁₃NO₂131.175 g/mol

Organic/Inorganic Small MoleculeChEBI source record

The L-enantiomer of isoleucine. — ChEBI

Safety references

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Identity & molecular properties

Source-linked values

CAS number	73-32-5	ChEBI ↗
Molecular formula	C₆H₁₃NO₂	ChEBI ↗
Molar mass	131.175 g/mol	ChEBI ↗
Monoisotopic mass	131.09463 Da	ChEBI ↗
Formal charge	0	ChEBI ↗
ChEBI identifier	CHEBI:17191	ChEBI ↗

Cross-source molecular data

PubChem

Molar mass	131.17 g/mol	PubChem ↗
Exact mass	131.094628657 Da	PubChem ↗
Computed XLogP	-1.7	PubChem ↗
Topological polar surface area (Å²)	63.3	PubChem ↗
H-bond donors	2	PubChem ↗
H-bond acceptors	3	PubChem ↗
Rotatable bonds	3	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

L-isoleucine

IUPAC name

L-isoleucine

InChIKey

AGPKZVBTJJNPAG-WHFBIAKZSA-N

SMILES

CC[C@H](C)[C@H](N)C(=O)O

InChI

InChI=1S/C6H13NO2/c1-3-4(2)5(7)6(8)9/h4-5H,3,7H2,1-2H3,(H,8,9)/t4-,5-/m0/s1

Classification & relationships

ChEBI ontology

L-alpha-amino acidChEBI parent class · 15705 ↗aspartate family amino acidChEBI parent class · 22658 ↗isoleucineChEBI parent class · 24898 ↗proteinogenic amino acidChEBI parent class · 83813 ↗

carboxylic acid amino acid organic molecular entity

Roles recorded in ChEBI

mouse metaboliteSaccharomyces cerevisiae metaboliteplant metaboliteEscherichia coli metabolitehuman metabolitealgal metabolite

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

0.0076234 mol

Uses 131.175 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 · 6 atoms

54.94%

O

Oxygen · 2 atoms

24.39%

N

Nitrogen · 1 atom

10.68%

H

Hydrogen · 13 atoms

9.99%

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

Isoleucine, a potent plasma glucose-lowering amino acid, stimulates glucose uptake in C2C12 myotubes. ↗Biochemical and biophysical research communications · 2003 Dec 26 · PMID 14651987

Isoleucine, a blood glucose-lowering amino acid, increases glucose uptake in rat skeletal muscle in the absence of increases in AMP-activated protein kinase activity. ↗The Journal of nutrition · 2005 Sep · PMID 16140883

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Sources & record history

Checked 27 Sep 2026

Identity, formula, mass, synonyms & ontologyEMBL-EBI ChEBI · CHEBI:17191

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

Additional molecular descriptorsNCBI PubChem · CID 6306 · 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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