Nitrogen

http://classyfire.wishartlab.com/tax_nodes/C0000001
http://classyfire.wishartlab.com/tax_nodes/C0000423
http://classyfire.wishartlab.com/tax_nodes/C0000453
http://classyfire.wishartlab.com/tax_nodes/C0000553
http://classyfire.wishartlab.com/tax_nodes/C0000553
http://classyfire.wishartlab.com/tax_nodes/C0004470
https://www.ebi.ac.uk/chebi/searchId.do?chebiId=CHEBI:17997
http://metacyc.org/META/new-image?type=COMPOUND&object=NITROGEN-MOLECULE
http://www.hmdb.ca/metabolites/HMDB0001371
http://www.genome.jp/dbget-bin/www_bget?drug:D00083
http://www.genome.jp/dbget-bin/www_bget?cpd:C00697
https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?cid=947
https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?sid=310265065
https://www.chemspider.com/Chemical-Structure.922.html
https://mor.nlm.nih.gov/RxNav/search?searchBy=RXCUI&searchTerm=7456
https://www.ebi.ac.uk/chebi/searchId.do?chebiId=17997
https://www.ebi.ac.uk/chembldb/index.php/compound/inspect/CHEMBL142438
https://www.ebi.ac.uk/pdbe-srv/pdbechem/chemicalCompound/show/HDZ
https://en.wikipedia.org/wiki/Nitrogen