Hydrogen phosphate INORGANIC PHOSPHATE GROUP IPS HYDROGENPHOSPHATE ION CHEBI:43474 HPO4(2-) [P(OH)O3](2-) [PO3(OH)](2-) hydrogen(tetraoxidophosphate)(2-) hydrogenphosphate hydrogentetraoxophosphate(2-) hydrogentetraoxophosphate(V) hydroxidotrioxidophosphate(2-)