regenerate

https://www.ebi.ac.uk/chebi/searchId.do?chebiId=CHEBI:16335
http://www.genome.jp/dbget-bin/www_bget?cpd:C00212
http://www.hmdb.ca/metabolites/HMDB0000050
http://www.genome.jp/dbget-bin/www_bget?drug:D00045
http://www.genome.jp/dbget-bin/www_bget?cpd:C00212
https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?cid=60961
https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?sid=46508728
https://www.chemspider.com/Chemical-Structure.54923.html
http://www.bindingdb.org/bind/chemsearch/marvin/MolStructure.jsp?monomerid=14487
https://mor.nlm.nih.gov/RxNav/search?searchBy=RXCUI&searchTerm=296
https://www.ebi.ac.uk/chebi/searchId.do?chebiId=16335
https://www.ebi.ac.uk/chembldb/index.php/compound/inspect/CHEMBL477
https://zinc.docking.org/substances/ZINC000002169830
http://bidd.nus.edu.sg/group/cjttd/ZFTTDDRUG.asp?ID=DAP000223
http://www.pharmgkb.org/drug/PA448049
https://www.ebi.ac.uk/pdbe-srv/pdbechem/chemicalCompound/show/ADN
http://www.rxlist.com/cgi/generic3/adenos.htm
https://www.drugs.com/cdi/adenosine.html
https://en.wikipedia.org/wiki/Adenosine