# Lexidronam pentasodium

**CAS:** 7651-99-2  
**PubChem CID:** [165629](https://pubchem.ncbi.nlm.nih.gov/compound/165629)  
**Molecular formula:** C₆H₁₅N₂Na₅O₁₂P₄  
**Molar mass:** 546.03 g/mol  
**IUPAC:** pentasodium;[2-[bis[[hydroxy(oxido)phosphoryl]methyl]amino]ethyl-(phosphonatomethyl)amino]methyl-hydroxyphosphinate  
**SMILES:** `C(CN(CP(=O)(O)[O-])CP(=O)([O-])[O-])N(CP(=O)(O)[O-])CP(=O)(O)[O-].[Na+].[Na+].[Na+].[Na+].[Na+]`  
**InChIKey:** `QPTMDBQLCWRDCK-UHFFFAOYSA-I`  
**InChI:** `InChI=1S/C6H20N2O12P4.5Na/c9-21(10,11)3-7(4-22(12,13)14)1-2-8(5-23(15,16)17)6-24(18,19)20;;;;;/h1-6H2,(H2,9,10,11)(H2,12,13,14)(H2,15,16,17)(H2,18,19,20);;;;;/q;5*+1/p-5`  

## Physicochemical properties

| Parameter | Value |
|---|---|
| PSA | 251 Ų |
| Hydrogen bond donors | 3 |
| Hydrogen bond acceptors | 14 |
| Rotatable bonds | 10 |
| Heavy atoms | 29 |

## 3D structure

The molecule contains 44 atoms connected by 38 chemical bonds. Interactive 3D model available at: https://molgod.org/molecule/7651-99-2/

## Synonyms

- EDTMP pentasodium salt
- Lexidronam pentasodium salt
- lexidronam pentasodium
- Ethylenediamine tetra(methylenephosphonic acid) pentasodium salt
- 2ZYX2V82AD
- EINECS 231-615-4
- Phosphonic acid, [1,2-ethanediylbis[nitrilobis(methylene)]]tetrakis-, pentasodium salt
- Ethylenediaminetetramethylenephosphonic acid, pentasodium salt
- Pentasodium Ethylenediamine Tetramethylene Phosphonate
- Phosphonic acid, (1,2-ethanediylbis(nitrilobis(methylene)))tetrakis-, pentasodium salt

## Data sources

- [PubChem CID 165629](https://pubchem.ncbi.nlm.nih.gov/compound/165629)
- [Wikidata](https://www.wikidata.org/wiki/Q27255875)
- [NIST WebBook](https://webbook.nist.gov/cgi/cbook.cgi?ID=7651-99-2)
- [ChEMBL](https://www.ebi.ac.uk/chembl/g/#search_results/all/query=7651-99-2)

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