ammonia azanide amide InChI=1S/H2N/h1H2/q-1 -1 [H][N-][H] H2N 16.01927 azanide HYGWNUKOUCZBND-UHFFFAOYSA-N NH2(-) 16.02262 dihydridonitrate(1-) CHEBI:29337 chebi_ontology hydridonitrate(2-) nitrogen hydride monovalent inorganic anion