Azithioprine

https://www.ebi.ac.uk/chebi/searchId.do?chebiId=CHEBI:2948
http://www.hmdb.ca/metabolites/HMDB0015128
http://www.genome.jp/dbget-bin/www_bget?drug:D00238
http://www.genome.jp/dbget-bin/www_bget?cpd:C06837
https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?cid=2265
https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?sid=46508252
https://www.chemspider.com/Chemical-Structure.2178.html
http://www.bindingdb.org/bind/chemsearch/marvin/MolStructure.jsp?monomerid=50373919
https://mor.nlm.nih.gov/RxNav/search?searchBy=RXCUI&searchTerm=1256
https://www.ebi.ac.uk/chebi/searchId.do?chebiId=2948
https://www.ebi.ac.uk/chembldb/index.php/compound/inspect/CHEMBL1542
https://zinc.docking.org/substances/ZINC000004258316
http://bidd.nus.edu.sg/group/cjttd/ZFTTDDRUG.asp?ID=DAP000782
http://www.pharmgkb.org/drug/PA448515
http://www.rxlist.com/cgi/generic/azathioprine.htm
https://www.drugs.com/cdi/azathioprine.html
https://en.wikipedia.org/wiki/Azathioprine