Topotel

https://www.ebi.ac.uk/chebi/searchId.do?chebiId=CHEBI:63632
http://www.hmdb.ca/metabolites/HMDB0015164
http://www.genome.jp/dbget-bin/www_bget?drug:D08618
http://www.genome.jp/dbget-bin/www_bget?cpd:C11158
https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?cid=60700
https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?sid=46505204
https://www.chemspider.com/Chemical-Structure.54705.html
http://www.bindingdb.org/bind/chemsearch/marvin/MolStructure.jsp?monomerid=50034026
https://mor.nlm.nih.gov/RxNav/search?searchBy=RXCUI&searchTerm=57308
https://www.ebi.ac.uk/chebi/searchId.do?chebiId=63632
https://www.ebi.ac.uk/chembldb/index.php/compound/inspect/CHEMBL84
https://zinc.docking.org/substances/ZINC000001611274
http://bidd.nus.edu.sg/group/cjttd/ZFTTDDRUG.asp?ID=DAP000648
http://www.pharmgkb.org/drug/PA451729
https://www.ebi.ac.uk/pdbe-srv/pdbechem/chemicalCompound/show/TTC
http://www.rxlist.com/cgi/generic2/topotec.htm
https://www.drugs.com/cdi/topotecan.html
https://en.wikipedia.org/wiki/Topotecan