# DL-methionine

**CAS:** 59-51-8  
**PubChem CID:** [876](https://pubchem.ncbi.nlm.nih.gov/compound/876)  
**Molecular formula:** C5H11NO2S  
**Molar mass:** 149.21 g/mol  
**IUPAC:** 2-amino-4-methylsulfanylbutanoic acid  
**SMILES:** `CSCCC(C(=O)O)N`  
**InChIKey:** `FFEARJCKVFRZRR-UHFFFAOYSA-N`  
**InChI:** `InChI=1S/C5H11NO2S/c1-9-3-2-4(6)5(7)8/h4H,2-3,6H2,1H3,(H,7,8)`  

## Physicochemical properties

| Parameter | Value |
|---|---|
| logP (XLogP3) | -1.9 |
| PSA | 88.6 Ų |
| Hydrogen bond donors | 2 |
| Hydrogen bond acceptors | 4 |
| Rotatable bonds | 4 |
| Heavy atoms | 9 |

## 3D structure

The molecule contains 20 atoms connected by 19 chemical bonds. Interactive 3D model 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

## 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 · Generator: MOL-GOD v3.12.33*