is conjugate acid of water oxonium trihydridooxygen(1+) chebi_ontology [OH3](+) Hydronium ion H3O CAS:13968-08-6 19.02322 aquahydrogen(1+) Hydronium cation oxidanium MolBase:1646 InChI=1S/H2O/h1H2/p+1 [H][O+]([H])[H] XLYOFNOQVPJJNP-UHFFFAOYSA-O +1 19.01784 CHEBI:29412 Gmelin:141 H3O(+) oxonium oxygen hydride onium cation