Berubigen

https://www.ebi.ac.uk/chebi/searchId.do?chebiId=CHEBI:17439
http://www.genome.jp/dbget-bin/www_bget?drug:D00166
http://www.genome.jp/dbget-bin/www_bget?cpd:C02823
https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?cid=70678590
https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?sid=46509031
https://www.chemspider.com/Chemical-Structure.21864832.html
https://mor.nlm.nih.gov/RxNav/search?searchBy=RXCUI&searchTerm=11248
https://www.ebi.ac.uk/chebi/searchId.do?chebiId=17439
https://www.ebi.ac.uk/chembldb/index.php/compound/inspect/CHEMBL2110563
http://www.pharmgkb.org/drug/PA451892
https://www.ebi.ac.uk/pdbe-srv/pdbechem/chemicalCompound/show/CNC
http://www.rxlist.com/cgi/generic/b12inj.htm
https://www.drugs.com/cdi/cyanocobalamin-b12.html
http://www.pdrhealth.com/drug_info/nmdrugprofiles/nutsupdrugs/vit_0262.shtml
https://en.wikipedia.org/wiki/Cyanocobalamin