# L-Isoleucine

CAS: 73-32-5
PubChem CID: 6306
InChIKey: AGPKZVBTJJNPAG-WHFBIAKZSA-N
Wikidata: Q484940
Molecular formula: C6H13NO2
Molar mass: 131.17 g/mol
IUPAC: (2S,3S)-2-amino-3-methylpentanoic acid
SMILES: CC[C@H](C)[C@@H](C(=O)O)N
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
logP (XLogP3): -1.7
PSA: 63.3 A^2
Hydrogen bond donors: 2
Hydrogen bond acceptors: 3
Rotatable bonds: 3
Heavy atoms: 9
3D structure: 22 atoms, 21 bonds

## About the compound

L-Isoleucine is a chemical compound registered under CAS number 73-32-5. Molecular formula: C6H13NO2. Molar mass: 131.17 g/mol. The full systematic IUPAC name is: (2S,3S)-2-amino-3-methylpentanoic acid. The molecule contains 22 atoms connected by 21 chemical bonds. 
Chemical data comes from the PubChem (NIH), ChEMBL (EBI) and NIST WebBook databases. GHS statement translations comply with the CLP Regulation (EC 1272/2008). Interactive 3D model and 2D skeleton available at: https://molgod.org/molecule/73-32-5/


## Synonyms

  - l-isoleucine
  - Isoleucine
  - 73-32-5
  - (2S,3S)-2-Amino-3-methylpentanoic acid
  - 2S,3S-Isoleucine
  - (S)-Isoleucine
  - (S,S)-Isoleucine
  - 2-Amino-3-methylvaleric acid
  - erythro-L-Isoleucine
  - L-Ile
  - Isoleucina
  - alpha-Amino-beta-methylvaleric acid

## Data sources

  - PubChem CID 6306: https://pubchem.ncbi.nlm.nih.gov/compound/6306
  - Wikidata: https://www.wikidata.org/wiki/Q484940
  - NIST WebBook: https://webbook.nist.gov/cgi/cbook.cgi?ID=73-32-5
  - ChEMBL: https://www.ebi.ac.uk/chembl/g/#search_results/all/query=73-32-5

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Last updated: 2026-09-25
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