dihydrogenphosphite phosphorus oxoacid phosphorous acid Gmelin:164068 81.98198 chebi_ontology [H]OP(O[H])O[H] CHEBI:36361 CAS:10294-56-1 phosphorous acid trihydroxidophosphorus trihydrogen trioxophosphate(3-) trioxophosphoric(3-) acid InChI=1S/H3O3P/c1-4(2)3/h1-3H CHEBI:29196 CHEBI:26081 OJMIONKXNSYLSR-UHFFFAOYSA-N [P(OH)3] phosphite H3O3P phosphorige Saeure H3PO3 81.99578 P(OH)3 0 phosphonic acid