nitrogen hydride hydrazinium(1+) hydrazinium(2+) Gmelin:186 DIDREYHESYMPRP-UHFFFAOYSA-N 34.05200 H3NNH3(2+) diazanediium +2 InChI=1S/H6N2/c1-2/h1-2H3/q+2 [NH3+][NH3+] 34.06112 hydrazinediium CHEBI:35325 chebi_ontology H6N2