has role fungicide phosphonic acids phosphorus oxoacid phosphonate(1-) phosphorous acid phosphonic acid [PHO(OH)2] H2PHO3 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. InChI=1S/H3O3P/c1-4(2)3/h4H,(H2,1,2,3) HPO(OH)2 ABLZXFCXXLZCGV-UHFFFAOYSA-N Phosphite 0 PDBeChem:PHS CHEBI:44976 chebi_ontology phosphonic acid CAS:13598-36-2 H3PO3 Phosphonsaeure CHEBI:26067 Phosphonic acid Reaxys:1209272 (HO)2HPO Phosphonate OP(O)=O 81.98198 hydridotrioxophosphoric(2-) acid Wikipedia:Phosphonic_acid H3O3P KEGG:C06701 dihydrogen hydridotrioxophosphate(2-) Gmelin:1619 81.99580 hydridodihydroxidooxidophosphorus