# DL-methionine

CAS: 59-51-8
PubChem CID: 876
InChIKey: FFEARJCKVFRZRR-UHFFFAOYSA-N
Wikidata: Q180341
Molecular formula: C5H11NO2S
Molar mass: 149.21 g/mol
IUPAC: 2-amino-4-methylsulfanylbutanoic acid
SMILES: CSCCC(C(=O)O)N
InChI: InChI=1S/C5H11NO2S/c1-9-3-2-4(6)5(7)8/h4H,2-3,6H2,1H3,(H,7,8)
logP (XLogP3): -1.9
PSA: 88.6 A^2
Hydrogen bond donors: 2
Hydrogen bond acceptors: 4
Rotatable bonds: 4
Heavy atoms: 9
3D structure: 20 atoms, 19 bonds

## About the compound

DL-methionine is a chemical compound registered under CAS number 59-51-8. Molecular formula: C5H11NO2S. Molar mass: 149.21 g/mol. The full systematic IUPAC name is: 2-amino-4-methylsulfanylbutanoic acid. The molecule contains 20 atoms connected by 19 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/59-51-8/


## Synonyms

  - DL-METHIONINE
  - 59-51-8
  - Racemethionine
  - Acimetion
  - Lobamine
  - Urimeth
  - (+-)-Methionine
  - DL-Methioninum
  - Methionine, DL-
  - 2-amino-4-methylsulfanylbutanoic acid
  - 2-amino-4-(methylsulfanyl)butanoic acid
  - FEMA No. 3301

## Data sources

  - PubChem CID 876: https://pubchem.ncbi.nlm.nih.gov/compound/876
  - Wikidata: https://www.wikidata.org/wiki/Q180341
  - NIST WebBook: https://webbook.nist.gov/cgi/cbook.cgi?ID=59-51-8
  - ChEMBL: https://www.ebi.ac.uk/chembl/g/#search_results/all/query=59-51-8

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Last updated: 2026-09-25
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