HN HNA HNB HNBA HNC HNCO HNCs HND HNDL HNDs HNE HNF HNF4 HNG HNIA HNIC HNJ HNK HNL HNLC HNLMS HNM HNMS HNMUN HNN HNO HNO2 HNO3 HNoMS HNP HNPCC HNRC HNS HNTB HNU HNUE HNV