# Benzenesulfinic acid, sodium salt

**CAS:** 873-55-2  
**PubChem CID:** [2723840](https://pubchem.ncbi.nlm.nih.gov/compound/2723840)  
**Molecular formula:** C₆H₅NaO₂S  
**Molar mass:** 164.16 g/mol  
**IUPAC:** sodium benzenesulfinate  
**SMILES:** `C1=CC=C(C=C1)S(=O)[O-].[Na+]`  
**InChIKey:** `CHLCPTJLUJHDBO-UHFFFAOYSA-M`  
**InChI:** `InChI=1S/C6H6O2S.Na/c7-9(8)6-4-2-1-3-5-6;/h1-5H,(H,7,8);/q;+1/p-1`  

## Physicochemical properties

| Parameter | Value |
|---|---|
| PSA | 59.3 Ų |
| Hydrogen bond donors | 0 |
| Hydrogen bond acceptors | 3 |
| Rotatable bonds | 1 |
| Heavy atoms | 10 |

## 3D structure

The molecule contains 15 atoms connected by 15 chemical bonds. Interactive 3D model available at: https://molgod.org/molecule/873-55-2/

## Synonyms

- BENZENESULFINIC ACID, SODIUM SALT
- Benzenesulfinic acid, sodium salt (1:1)
- RefChem:1078624
- DTXCID3048576
- Sodium phenylsulfinate
- Sodium benzenesulphinate
- sodium;benzenesulfinate
- C6H5NaO2S
- sodium benzene sulfinate
- sodiumphenylsulfinate

## Data sources

- [PubChem CID 2723840](https://pubchem.ncbi.nlm.nih.gov/compound/2723840)
- [Wikidata](https://www.wikidata.org/wiki/Q72507714)
- [NIST WebBook](https://webbook.nist.gov/cgi/cbook.cgi?ID=873-55-2)
- [ChEMBL](https://www.ebi.ac.uk/chembl/g/#search_results/all/query=873-55-2)

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*Last updated: 2026-10-17 · Generator: MOL-GOD v3.12.33*