phosphonic acid

CHEBI:44976 ·resolve ·ANTIFUNGAL ·EXACT SEEDED

A phosphorus oxoacid that consists of a single pentavalent phosphorus covalently bound via single bonds to a single hydrogen and two hydroxy groups and via a double bond to an oxygen. The parent of the class of phosphonic acids. — ChEBI

Machine-generated and unreviewed. Identity, structure and cross-references come straight from ChEBI's and CARD's own data; no curator has signed off on this record yet.

Classification

Strictly broader compounds or drug classes this molecule belongs to.

CHEBI:26069 CHEBI:26069
CHEBI:33457 CHEBI:33457

Chemical structure

Computed structure properties
Molecular formula	H3O3P
Charge	0
Average mass	81.995 Da
Monoisotopic mass	81.98198 Da
Source	ChEBI
InChIKey	ABLZXFCXXLZCGV-UHFFFAOYSA-N

SMILES

[H]OP([H])(=O)O[H]

InChI

InChI=1S/H3O3P/c1-4(2)3/h4H,(H2,1,2,3)

Also called

dihydrogen hydridotrioxophosphate(2−) (EXACT_SYNONYM)— chebi
hydridodihydroxidooxidophosphorus (EXACT_SYNONYM)— chebi
hydridotrioxophosphoric(2−) acid (EXACT_SYNONYM)— chebi
(HO)2HPO (EXACT_SYNONYM)— chebi
H2PHO3 (EXACT_SYNONYM)— chebi
H3PO3 (EXACT_SYNONYM)— chebi
HPO(OH)2 (EXACT_SYNONYM)— chebi
Phosphite (EXACT_SYNONYM)— chebi
Phosphonate (EXACT_SYNONYM)— chebi
Phosphonic acid (EXACT_SYNONYM)— chebi
Phosphonsäure (EXACT_SYNONYM)— chebi
[PHO(OH)2] (EXACT_SYNONYM)— chebi

Cross-references

Equivalent identifiers for this same structure in other resources.

cas:13598-36-2
gmelin:1619
kegg.compound:C06701
pdb-ccd:PHS
reaxys:1209272
wikipedia.en:Phosphonic_acid

Activity roles

Every antimicrobial role a source asserts for this compound — the unreduced evidence behind its antimicrobial_class.

CHEBI:24127 CHEBI:24127

Source concepts

Every upstream concept that resolved to this record. The merge is the product: this is what shows ChEBI and CARD are describing the same structure.

Upstream concepts merged into this record
Source	Native ID	Label	Minted CURIE	Version
CHEBI	`CHEBI:44976`	phosphonic acid	`antibioticmech:chebi-e2b45fd74f`	2026-08-30

Curation history

SEEDED_FROM_SOURCES 2026-08-30 · seed_from_sources
Seeded from data/raw/ inventories (CHEBI)
RESEEDED_FROM_SOURCES 2026-08-30 · seed_from_sources
Re-seeded from updated data/raw/ inventories
RESEEDED_FROM_SOURCES 2026-08-30 · seed_from_sources
Re-seeded from updated data/raw/ inventories

Provenance

Seeded by scripts/seed_from_sources.py from the committed inventories in data/raw/. View the record.