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.

Label unavailable CHEBI:26069
Label unavailable 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

Identifiers for this same structure in other resources. An accession that lands on two different structures in this corpus is withheld from both rather than shown here, since it names at most one of them.

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

Patents and articles

Documents about this compound. A patent covers a class and an article covers a topic; neither identifies a structure.

wikipedia.en:Phosphonic_acid

Activity roles

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

fungicide 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
RESEEDED_FROM_SOURCES 2026-09-10 · 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 (YAML).

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