Naprobin

http://www.genome.jp/dbget-bin/www_bget?drug:D01907
https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?cid=657237
https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?sid=46507525
https://www.chemspider.com/Chemical-Structure.571392.html
http://www.bindingdb.org/bind/chemsearch/marvin/MolStructure.jsp?monomerid=68391
https://mor.nlm.nih.gov/RxNav/search?searchBy=RXCUI&searchTerm=24698
https://www.ebi.ac.uk/chebi/searchId.do?chebiId=94701
https://www.ebi.ac.uk/chembldb/index.php/compound/inspect/CHEMBL1568
https://zinc.docking.org/substances/ZINC000004216238
http://bidd.nus.edu.sg/group/cjttd/ZFTTDDRUG.asp?ID=DAP000567
http://www.pharmgkb.org/drug/PA449655
http://www.rxlist.com/cgi/generic/fludarabine.htm
https://www.drugs.com/cdi/fludarabine.html
https://en.wikipedia.org/wiki/Fludarabine